[Cyberdog]

Swift was annoying in the early days since searches would bring up info on the international payment system.

Lua and PHP have nice searchability. At least, it's fairly easy to weed out results on the Portuguese moon and the Philippine peso.

[dhosek]

I remember trying to Lycos/Altavista/Yahoo info on C or C++ back in the 90s. Perl also ended up being a challenge because a lot of results would be things like http://example.com/cgi-bin/perl/irrelevant-result.