Take a simultaneous look at this search string in Google, Twitter and Bing (on search3) :
As you can see, the relevancy of the search results in Bing aren’t accurate at all. Why? Because apparently Bing thought it would be ok to toss out part of the search string (in this case the underscore). How dumb. A simple thing that M$ has failed at and the reason that the results I get in Bing are always irrelevant in my experience. This is why I’ve dubbed Bing as the ‘Old Lady Search Engine’.
Because in their effort to simplify the results, they’ve actually made it useless.