NOT condition not working in solr - solr

I am no Korean expert and am finding it difficult to fix this, searching for the following query, but the NOT condition doesn't seem to be working.
(stnostem:((옵티머스 OR "엘지 스마트폰") AND NOT ("옵티머스 프라임" OR 프라임)))
the search result return result with the NOT condition keywords? How can this be fixed.
Regards,
Ayush


You might try using the - to specify a pure negative query. Try the following:
stnostem:(옵티머스 OR "엘지 스마트폰") -stnostem:("옵티머스 프라임" OR 프라임)
You may need the AND between the two queries depending upon what your DefaultQueryOperator is.

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