My biggest gripe with IOS right now Dan Moren hits perfectly in his MacWorld Article
Even basic search in some places seems woefully broken. Take Settings on iOS, for example: if you want to search for a particular section, say, Messages, you’ll find yourself wading through dozens of irrelevant results to find the one you’re looking for, if you can find it at all.
Why they can't figure this out, I'll never know. It's not a new problem, but seems to have NO attempt to fix.