The first and the third result seems resonable to me, Free, have over 100.000 install, in category Travel, and related to Travel as well.

Those "TRIPOSO TRAVEL GUIDES" app is a little problem there, but most of them have over 1.000 install, and related to Travel, then the result is acceptable.

The truth is, when I search an app name in the Market, I expect an App that have this function, not the App have this name. Doing this can prevent malware app have a fake name. I don't really know how Google do search at the Market, but I always found what I wanted here.

And remember you're searching for 'usa' 'travel' and 'guide' and it combination, not the whole text.