Problem with the site's search

Hi, I’m having a problem I don’t quite now where I should report:

I’m having trouble finding some posts I made in the past, as well as some threads I found interesting a while ago (and didn’t bookmark) but the site’s search function is not helping, I tried searching my own name, user name e-mail, and the topic title’s and related words I can remember, but they are not showing in the results.

What may be causing this?

Note: I ended up showing 100 posts per page and browsing the list using the browser’s seach function and found the threads I wanted (luckily I knew in which forum they were), but that’s far from optimal.

you might want to put your comment here, in order to be more easily heard:

will do, thanks.