Wilsons Sandbox

can anyone help with how the "search" function does, or is supposed to , operate? I put in a key word, and may or may not get a list of messages that contain that word? Also, is it possible to enter multiple search words? I tried various "boolean" variables (and/or) as well as separating the words by commas, spaces, etc. NOTHING seems to work real well. When I did a "search" of the Yahoo database itself, the "search" function seems to refer more to searching FOR a group, than searching WITHIN a group. Any help !?