'9mm' found 122976 times in 83183 documents
'1911' found 102229 times in 70262 documents
complete matches found in 7235 documents
If you mean that you want to search for "9mm 1911" as a phrase, then
you need to use google. But it seems to me that the search mechanism is ANDing search terms, just like you want it to.
And, zoomie, BTW TFL does _not_ use the standard vbulletin search mechanism. 2-letter words are allowed, except for a few extremely common words ("an", "to", that sort of thing).