Is anyone else having problems with the Yahoo email search function? Am I doing something wrong?

Even when I search for a known email, all my searches come up blank. I've tried searching on a word in the subject (of the full subject), key word in the email body, and on who the email is from. No dice on any of these searches.|||The search feature hasn't been working correctly for the past few months, for some it's sporadic. Yahoo said they are trying to get it fixed. They don't say how long it will take.