Hey Shane!
From my experience, using Velo is a great way to be able to search the content manager. The Velo forum (https://community.wix.com/velo/forum/coding-with-velo) might be a great place to start 
Otherwise, here’s a support article which includes what can and can’t be searched with the search app - About Wix Site Search | Help Center | Wix.com
Hope it helps