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For software already installed, Emacs should have an index of all your "info" format documents, usually bound to "C-h i".

Then you can use "m" or "C-s" to find the manual you want.

I don't think there's any stock full-text search of all installed manuals at once, but, once you're in a manual, then the various means of navigation are usually very efficient, and (sadly) generally better than most manuals in HTML.

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"m" is to select a menu item from the list presented on the current page. "C-s" is for text search across the whole manual. And then there is "i" which is to search in the index of the manual.

You can run M-x info-apropos to search in all known Info files at once:

"Grovel indices of all known Info files on your system for STRING. Build a menu of the possible matches."

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