I just tried RCS on the advanced search and it works fine.
http://www.rcuniverse.com/forum/sear...mitbutton=+OK+
Also you must play with the drop downs if using the bottom right search as the results will vary depending on your settings. That bottom right search box looks ONLY through the forum that it is in and not all forums.
I searched for OS 1.60 (no quotes) and specified at the bottom to use "exact phrase" and it found pages of results.
http://www.rcuniverse.com/forum/sear...mitbutton=+OK+