>posix AND NOT (posix.pl)
This still gets 20,000 hits!
Yes, you can correct this particular case with a revised query; but,
wouldn't it be nice if the search engines were a little smarter about the
context of the word in the document?
As another example, try searching for "HTML". AltaVista gets 900,000
matches. I have yet to find a query for documents about HTML which works on
any of the search engines. For example, excluding "(HTML)" excludes all
documents!
I had one heck of a time finding the RFC for HTTP because of this.