[VLSP 2025] ViDRILL is a Vietnamese document retrieval system for VLSP 2025. It combines dense and sparse retrieval, reranking, and optional LLM-based query rewriting and reasoning to support high-accuracy information retrieval and future LLM-enhanced pipelines.

For VLSP 2025 MLQA-TSR, this method achieved a top-5 ranking (F2 = 0.54) for retrieval and a top-1 ranking (accuracy = 0.86) for question answering.