About me

Hi! I’m Nguyen Song Thien Long (publishing as Long S. T. Nguyen ORCID iD icon ). I’m a final-year undergraduate student in Computer Science at 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, where I am mentored by Prof. Luu Anh Tuan (Nanyang Technological University, Singapore) and Dr. Nguyen Tran Cong Duy (Postdoctoral Researcher, CAIR). I also serve as a Principal Investigator at Saigon AI Hub, VNG Group.

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 minority languages, with applications including Neural Machine Translation (NMT).

You can contact me via:

I am based at VNPT Lab (HCMUT – Main Campus, 268 Ly Thuong Kiet Street, Dien Hong Ward, Ho Chi Minh City, Vietnam). Please contact me before visiting.

My academic CV is available here.



Latest News

  • Sep 2026: 1 paper accepted at AACL-IJCNLP 2026 (CORE B)
  • Aug 2026: 1 paper accepted at EMNLP 2026 (CORE A*)
  • Aug 2026: 1 paper accepted at IEEE Journal of Biomedical and Health Informatics (SCIE, Q1)
  • Jul 2026: 1 paper accepted at Taiwan Journal of Linguistics (ESCI, Q3)
  • Jul 2026: 1 paper accepted at IEEE Access (SCIE, Q1)
  • Mar 2026: 1 paper accepted at Computers & Education: Artificial Intelligence (SCIE, Q1)
  • Feb 2026: 1 paper accepted at ACIIDS 2026 (CORE B)
  • 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 AAAI/EAAI 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, Dat T. Huynh, Quynh T. N. Vo, Dang Le, Cong-Duy Nguyen, Anh Tuan Luu, Anh Nguyen-Duc, and Tho T. Quan. Fast and Focused: Interactive Repository-Level Fill-in-the-Middle Code Completion with Hybrid Structural Retrieval. Conference on Empirical Methods in Natural Language Processing (EMNLP), 2026. (A*-ranked Conference) (Acceptance rate: 2719/17669 = 15.4%)
  2. 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. AAAI Symposium on Educational Advances in Artificial Intelligence (EAAI), 2026. (Symposium at A*-ranked Conference) (Acceptance rate: 55/242 = 22.7%) [pdf] [bib] [website]
  3. Long S. T. Nguyen and Tho T. Quan. Which Works Best for Vietnamese? A Practical Study of Information Retrieval Methods across Domains. Findings of the Association for Computational Linguistics: EACL, 2026. (A-ranked Conference) [pdf] [bib] [website]
  4. 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. Findings of the Association for Computational Linguistics: EACL, 2026. (A-ranked Conference) [pdf] [bib] [website]
  5. 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. Findings of the Association for Computational Linguistics: IJCNLP-AACL, 2025. (B-ranked Conference) [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 Service

Program Committee: AAMAS 2027 (CORE A); AAAI/EAAI 2027 (CORE A*); ACM WSDM 2027 (CORE A).

Conference Reviewer: WWW 2027 (CORE A*); ACM MM 2026 (CORE A*).

Journal Reviewer: IEEE Transactions on Neural Networks and Learning Systems (SCIE, Q1); Expert Systems with Applications (SCIE, Q1); Engineering Applications of Artificial Intelligence (SCIE, Q1); IEEE Access (SCIE, Q1); Behaviour & Information Technology (SCIE, SSCI, Q1); Journal of Natural Language Processing (SCIE, SSCI, AHCI, Q1).

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. Viet Nam National Union of Students Central Committee, 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]