As a shortcut, you can type "voo*", instead of "voodooman". The asterisk will select any characters after the "voo". (You need at least two characters before the asterisk).
If you just want Mark Series amps, type: "mesa (mark, mk)". Stuff in parentheses is treated as either/or. You can string them all together, as in: "mesa (mark, mk, mav*) -case -3/8 -d2f -ad -ata -tuff* -voo*", etc., etc., ad nauseum.
(The above search string would include Mavericks.)
Also, search in "All Categories", not just "Musical Instruments", or "Mesa Boogie". It's amazing how much stuff is in the "wrong" category on eBay.