A legal search engine expands a query for "Intellectual Property Rights" (IPR) to include synonyms like "Patent Law" and "Copyright Law", but users report that irrelevant documents appear frequently.
Which technique can best balance precision and recall?
Use a hybrid search approach combining semantic and keyword-based retrieval
Disable query expansion and rely only on exact matching
Increase the weight of keyword frequency in ranking
Manually curate synonym mappings to limit expansion