Okay, here's one example. A couple days ago I tried searching for some info on the on light gun with the ArcadeVGA card issue. I remember the problem being discussed a few months back, but I couldn't remember the solution. So I went to the advanced search and typed in "lightgun arcadevga" and changed the "Max age since last post" to 300, and the clicked "search". I came up with no results. I tried the same thing, but this time searching only the main and monitor forums, still nothing. I eventually found my info by doing a one word search and then wading through lots of irrelevant posts. That post BTW, did contain both of those words.
I tried this same search just now, and I only got one result (a post I made two days ago). I still don't see the info from a few months ago come up. Anyway this happens to me quite often, and I find myself trying different variations of the search, just to find something. If it's fairly recent, I tend to use the "next page" thing and use my browser's word search.
Anyway that's my plight. (BTW, I also did try using "any poster" in my above search, and it made not difference in my case.)