I have experienced problems before with the CH search not finding what I *knew* was there. A couple of days ago, however, I wanted to bump a recent thread on hospital food to add to the discussion. The title of the thread was/is "How is the hospital food where you live?"
I searched "General Chowhounding Topics" and a general search. I used "hospital food" and "hospital" in the search box, and neither turned up the topic.
It's not like what I was looking for was obscure or buried in a reply, it was in the thread title.
If the search engine can't find something that simple, perhaps a new search engine is in order.