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You can check using querybuilder debugger this kind of queries (http://localhost:4502/libs/cq/search/content/querydebug.html):
1) for DAM assets and search text only in the title property of a asset:
fulltext.relPath=jcr:content/*/@dc:title OR fulltext.relPath=jcr:content/metadata/@dc:title
2) for content pages and text serach only in the jcr:title property for a page:
I hope that this helps you somehow
The information regarding query builder is really helpful. But i need to customize the default search in CQ5.5 DAM (http://localhost:8080/damadmin) . I need information regarding where to put that property restricitng predicate in the defaut search.
Overlay  to apps and define as per your need. Attaching the quick snapshot for your review for searching only for property dc:title without overlay.
More Details please refer .