Re: Advanced Search plugin needed
BP Member Filter is a plugin by JJJ that does what you want:
https://wordpress.org/extend/plugins/bp-member-filter/
I’ve tested this back in the BP 1.1.3 days and it worked to some extent.
Haven’t tested this with BP 1.2.
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You could also potentially use the “Search Engine” plugin by Scott Kingsley Clark:
https://wordpress.org/extend/plugins/search-engine/
It works as a spider so it indexes all content on your site (so I’m guessing it would include BP content)… I should state that I haven’t used this though.
But it wouldn’t offer the “advanced search” functionality you’re looking for. More like a sitewide search.
