I started a thread to discuss this same issue before I found this thread. It's been 3 years since the last posts here, the issue still remains. The search function in Hyperspin returns much more expected results because it defaults to game title search. In addition the results are separated by platform so it's really pleasant to use. Searching in Bigbox (I'm using an arcade cabinet, thus I'm not searching in Launchbox as much) yields an unsorted, long list of unexpected results, meaning I can't really find what I'm looking for most of the time.
It seems @Jason Carr disagrees fundamentally with whole word or game title search based on his reply above. That's such a bummer because when you have a large library the search is really crucial. It seems many people, myself included, have raised this concern either on forum posts or officially through bitbucket. That indicates enough demand I think to work on this. It seems like it would be easy to add a simple option to "search game title only" or something like that and default to whole word search in that mode. That way you can search up NBA games without Pinball showing up or Sonic games without Panasonic showing up.