I assume you could use the google “site” boolean to search within a specific instance.
For example, starting your search with:
site:lemmy.world
And then add a space plus your search terms to give something like:
site:lemmy.world how to search
That would limit the search to indexed results appearing in the lemmy.world domain.
I have no idea how often any given instance is indexed by google’s crawlers…
Did he sign the guestbook at the Führerbunker?
America may have to tap into its emergency Champagne reserves…