About me

Hi! I’m Nguyen Song Thien Long (publication name: Long S. T. Nguyen ORCID iD icon ). I’m a third-year undergraduate student in Computer Science at the Ho Chi Minh City University of Technology (HCMUT), Vietnam.

I am currently a Research Assistant at the URA Research Group, working under the supervision of Prof. Quan Thanh Tho (Dean of the Faculty of Computer Science and Engineering, HCMUT). I am also an AI Researcher at the Center for AI Research (CAIR), VinUniversity, mentored by Prof. Luu Anh Tuan (Nanyang Technological University, Singapore) and Dr. Nguyen Tran Cong Duy (Postdoctoral Researcher, CAIR).

Before university, I studied in the math-specialized program at Ben Tre High School for Gifted Students. I am originally from Ben Tre, Vietnam.

My research interests lie in Natural Language Processing (NLP), with a focus on Information Retrieval (IR), Question Answering (QA), and Large Language Models (LLMs). My work centers on Retrieval-Augmented Generation (RAG), hybrid lexical–semantic retrieval, and reliable reasoning in both agent-based and standalone LLM systems. I am particularly interested in developing efficient, interpretable, and trustworthy methods for low-resource and multilingual settings, especially Vietnamese and under-resourced ethnic languages, with applications including Neural Machine Translation (NMT).

You can contact me via:

You can also meet me in person at VNPT Lab (HCMUT – Main Campus, 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Vietnam). Please inform me in advance before visiting.

My academic CV is available here.



Latest News

  • Apr 2026: Invited as a reviewer for Journal of Natural Language Processing (SCIE, SSCI, AHCI, Q1)
  • Mar 2026: 1 paper accepted at Computers and Education: Artificial Intelligence (SCIE, Q1, #1 in Education)
  • Feb 2026: Invited as a reviewer for Behaviour and Information Technology (SCIE, SSCI, Q1)
  • Feb 2026: 1 paper accepted at ACIIDS 2026 (CORE B)
  • Feb 2026: Invited as a reviewer for IEEE Transactions on Neural Networks and Learning Systems (SCIE, Q1)
  • Jan 2026: Invited as a reviewer for Connection Science (SCIE, Q2)
  • Jan 2026: Invited as a reviewer for IEEE Access (SCIE, Q1)
  • Jan 2026: 2 papers accepted at EACL 2026 (CORE A)
  • Dec 2025: 1 paper accepted at ICAART 2026 (CORE B)
  • Oct 2025: 1 paper accepted at EAAI (AAAI) 2026 (CORE A*)
  • Oct 2025: 1 paper accepted at IJCNLP–AACL 2025 (CORE B)
  • Jun 2025: 1 paper accepted at ICCCI 2025 (CORE B)
  • May 2025: 1 paper accepted at AIED 2025 (CORE A)
Selected Publications

A selected list of publications is presented below; the full list is available on the publications page, and citation information is provided on my Google Scholar profile.

  1. Long S. T. Nguyen*, Quan M. Bui*, Tin T. Ngo, Quynh T. N. Vo, Dung N. H. Le, and Tho T. Quan. ViHERMES: A Graph-Grounded Multihop Question Answering Benchmark and System for Vietnamese Healthcare Regulations. Asian Conference on Intelligent Information and Database Systems (ACIIDS), 2026. (B-ranked Conference) [preprint]
  2. Long S. T. Nguyen and Tho T. Quan. Which Works Best for Vietnamese? A Practical Study of Information Retrieval Methods across Domains. Conference of the European Chapter of the Association for Computational Linguistics (EACL), 2026. (A-ranked Conference) [pdf] [bib] [website]
  3. Hung Luu, Long S. T. Nguyen, Trung Pham, Hieu Pham, and Tho Quan. HiGraAgent: Dual-Agent Adaptive Reasoning over Hierarchical Knowledge Graph for Open-Domain Multi-hop Question Answering. Conference of the European Chapter of the Association for Computational Linguistics (EACL), 2026. (A-ranked Conference) [pdf] [bib] [website]
  4. Long Nguyen, Duc Nguyen, Quan Bui, Dung Phan, Dung Le, Khanh Nguyen, Quynh Vo, Khang Vo, Nam Duong, Anh Dinh, Tri Trinh, Chi Phan, An Nguyen, Thai Nguyen, Dang Le, Vinh Dang, and Tho Quan. Catching the First Light of Tomorrow: A Hackathon-Based Framework for Introducing High School Students to AI Agents. Symposium on Educational Advances in Artificial Intelligence (EAAI), co-located with AAAI, 2026. (Symposium at A*-ranked Conference) [pdf] [bib] [website]
  5. Dung T. Phan*, Chi N. L. Phan*, Long S. T. Nguyen*, Phuc T. Dao, Quan M. Bui, Tin T. Ngo, Thi T. Nguyen, and Tho T. Quan. MAFIA-NeT: Multi-Agent Framework for Interactive Agricultural Negotiation and Trading Systems. International Conference on Agents and Artificial Intelligence (ICAART), 2026. (B-ranked Conference) [pdf] [bib] [website]
  6. Long S. T. Nguyen, Quynh T. N. Vo, Hung C. Luu, and Tho T. Quan. When in Doubt, Ask First: A Unified Retrieval Agent-Based System for Ambiguous and Unanswerable Question Answering. International Joint Conference on Natural Language Processing & Asia-Pacific Chapter of the Association for Computational Linguistics (IJCNLP-AACL), 2025. (B-ranked Conference) [pdf] [bib] [website]
  7. Long S. T. Nguyen, Truong P. Hua, Thanh M. Nguyen, Toan Q. Pham, Nam K. Ngo, An X. Nguyen, Nghi D. M. Pham, Nghia H. Nguyen, and Tho T. Quan. A Benchmark Dataset and Evaluation Framework for Vietnamese Large Language Models in Customer Support. International Conference on Computational Collective Intelligence (ICCCI), 2025. (B-ranked Conference) [pdf] [bib] [website]
  8. Duc Nguyen, Dong Le, Long Nguyen, Quyen Vu, Tran Le, Dung Nguyen, Nga Huynh, Huong Nguyen, Phat Tran, Dang Le, Sang Truong, Sanmi Koyejo, Cuong Le, and Tho Quan. Riding on The Back of A Whale: A Hackathon Framework for Introducing High School Students to Large Language Models. Conference on Artificial Intelligence in Education (AIED), 2025. (A-ranked Conference) [pdf] [bib] [website]
  9. Long S. T. Nguyen, Tran T. B. Le, Huong P. N. Nguyen, Quynh T. N. Vo, Phong H. N. Nguyen, and Tho T. Quan. Serving the Underserved: Leveraging BARTBahnar Language Model for Bahnaric-Vietnamese Translation. Workshop on Language Models for Underserved Communities (LM4UC), at NAACL, 2025. (Workshop at A-ranked Conference) [pdf] [bib] [website]
  10. Long S. T. Nguyen and Tho T. Quan. URAG: Implementing a Unified Hybrid RAG for Precise Answers in University Admission Chatbots – A Case Study at HCMUT. Symposium on Information and Communication Technology (SoICT), 2024. [pdf] [bib] [website]
intellectual property
  1. Quan Thanh Tho, Pham Quoc Nguyen, Nguyen Quang Duc, Nguyen Song Thien Long, Nguyen Tran Quy, Le Thanh Bao Tran, Nguyen Phuoc Ngoc Huong, Vo Thi Nhu Quynh, Nguyen Vu Bach. Automatic Translation from Vietnamese Text to Ba Na Text. Copyright Office, Ministry of Culture, Sports and Tourism of Vietnam, 2025. [pdf]
  2. Quan Thanh Tho, Tran Khanh Tung, Nguyen Quang Duc, Nguyen Song Thien Long, Nguyen Tran Quy, Nguyen Huu Nam Phong, Le Bao Huy, Tran Viet Phu, Nguyen Quoc Minh Phuong, Bui Quang Minh. Ba Na Speech Synthesis from Ba Na Text. Copyright Office, Ministry of Culture, Sports and Tourism of Vietnam, 2025. [pdf]
Academic Services

Invited Reviewer:

  • IEEE Transactions on Neural Networks and Learning Systems (SCIE, Q1, IF: 8.9)
  • IEEE Access (SCIE, Q1, IF: 3.6)
  • Connection Science (SCIE, Q2, IF: 3.4)
  • Behaviour and Information Technology (SCIE, SSCI, Q1, IF: 3.1)
  • Journal of Natural Language Processing (SCIE, SSCI, AHCI, Q1, IF: 1.9)
  • International Journal of Knowledge-Based and Intelligent Engineering Systems (ESCI, Q3, IF: 1.5)

Founder and Organizer:

  • XAI Challenge for Educational Question-Answering (TRNS-AI Workshop, IEEE IJCNN 2025)
  • The 2nd International XAI Challenge for Transparent Educational Question-Answering (IEEE IJCNN 2026)
  • Annual CSE Summer School for High School Students (HCMUT, since 2024)

National Olympiad Support:

  • Technical and training support for the organization of VOAI 2025 and the preparation of Vietnam's IOAI 2025 team [proof]
Selected Achievements
  1. Outstanding "Student with 5 Good Criteria" Award. Central Committee of the Vietnam National Union of Students, Vietnam. (National, 2025) [proof]
  2. Outstanding Student Award. Ho Chi Minh City University of Technology (HCMUT), Vietnam. (Institutional, 2025) [proof]
  3. Outstanding International Journal Publication Award. Vietnam National University Ho Chi Minh City (VNU-HCM), Vietnam. (Institutional, 2025) [proof]
  4. Third Prize. Science and Technology Awards for Students in Higher Education Institutions. Ministry of Education and Training, Vietnam. (National, 2025) [proof]
  5. Excellent Work Award. International ICT Innovative Services Awards (InnoServe Awards). Ministry of Digital Affairs, Taiwan, and Ministry of Education, Taiwan. (International, 2025) [proof]
  6. Finalist (Top 15). Best AI Awards. Ministry of Economic Affairs, Taiwan. (International, 2025) [proof]
  7. Finalist (Top 50). DIVE Global Data Hackathon. Busan Metropolitan City, Republic of Korea. (International, 2025) [proof]
  8. Consolation Award. AI Thuc Chien Competition. Ministry of Public Security, Vietnam, Vietnam Television, National Data Center, National Data Association, and Techcombank. (National, 2025) [proof]
  9. First Prize. FinTech Attacker 2025. University of Economics and Law (UEL) and International Data Group (IDG), Vietnam. (National, 2025) [proof]
  10. First Prize (Startup Category). Bach Khoa Innovation. Ho Chi Minh City University of Technology (HCMUT) and Department of Science and Technology of Ho Chi Minh City, Vietnam. (National, 2025) [proof]