I haven't noticed a case where searching has returned a hit on only one of several words, OR where it's returned results where different words hit on different posts in the same thread.
I searched for "9mm 1911" and spot-checked a few results, and those words occurred in the same post.
I also just searched for "paragraph operator", which I think should hit this thread if what you claim is true, and this thread wasn't returned as a result. (well, it will hit this thread now, but pick two uncommon words in different posts and search)
Google, on the other hand, will return results with search words in different posts, because it indexes by thread (more accurately, per page... which means groups of about 25 posts).
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"Want to keep guns out of the hands of felons? Make fewer felons in the first place." --Vanya