While not ideal, the site's regular search bar is decent and allows searches by forum member on my tablet (but not phone).
The biggest issue is no 3 letter word searches, but it has served me well for pipes, tobacco, words and phrases (if quotation marks are used, and locating a comment I recall a certain member making (
@JOHN72 will forever make me smile with "I'll kick your ass, like a fresh cauliflower" since it is such a pure, comical, and emotional quote).
You can also search threads you've created or posted in using a separate search function on the site.
Also, I believe
@woodsroad created a Google search program, the link to which is in the recent C.S. Lewis thread (my link skills by phone are terrible, so forgive me).