Using Synonyms is actually narrowing the result set in some cases

Hi,

I recently introduced a small set of synonyms to be expanded at query time. I didn't and would not want to modify the index so applied synonyms to query.

Synonyms match correctly and the query is expanded indeed, however in some cases , usually multi word synonyms the query is returning less results than it would without synonyms..

Any pointers to where the problem could be?


Example:

before synonyms

search for crm about 1000 results

synonyms implemented

crm, customer relationship management

search for crm about 200 results

One would expect solr to return more results as a result of using synonyms but the effect is exactly opposite..


Thanks
Raj