How do you design a multilingual semantic search engine that accurately handles mixed-language queries like 'blue wali dress under 500' despite having zero exact keyword matches?

1. Separate constraints from semantic meaning. 2. Normalize code-mixed and transliterated text. 3. Embed into a shared cross-lingual space. 4. Retrieve with dense vectors, not keywords. 5. Extract structured entities as a parallel signal. 6. Combine semantic score with filters and business signals. 7. Retrain on code-mixed click data.