Overview
If a synonym set contains a multi-word synonym with spaces, wrap the search term in double quotes to ensure that the search term is treated as a potential synonym.
Example
If there is a synonym set with a synset value of Test,Application,Test Application, performing a search for test application (without quotes) won't be treated as a synonym. But, wrapping the search term in double quotes "test application" will ensure that any active synonym sets are checked for a matching synset value.