I don't know what the issue is, but this doesn't work for me. I just did a couple of tests that should have produced multiple results and in one case I got nothing found at all and in the second only one result found with no message about only displaying relevant results. I find that even with regular searches (not advanced narrowing the domain to the forums), on the rare occasions a Google search finds something in the forums, clicking on the link usually results in an error message from the forums saying they couldn't determine which page I as trying to view.
Seems like Google doesn't index everything, only (some?) thread titles and some Profile.
Searching for "Arthmoor" yielded two hits: his Arthmoor's Villages thread and his profile
Searching for "andalaybay" yielded noting.
Searching for "Psymon" yielded noting.
Searching for "PetrusOctavianus" yields one hit to a page named "PetrusOctavianus' Textures Downloads" which leads to page two of Psymon's thread named "BAIN Mod Installation Projects" in which I've posted.
Searching for "Faregyl" yields no hits whatsoever. :huh:
Weird...but searching for Relz and/or the name of the mod should work in most cases.