Hi Prashant,
You can search it by adding escape '\' character, f.e.:
+status:(Not\ Accredited)
or
+status:"Not Accredited"
And make sure that you are using appropriate Analyzer type (f.e. White space or something...).
Can you verify is that field that you want to search exist in you search index? Go to search fields and verify that you checked 'content' and 'searchable' on that status field. Also, you can use Apache Lucene to see exactly indexed fields inside indexer.