I ended up giving up on Bing, as it was coming up short in other areas. Going back to Google, I found one way to tell why they showed a result. It seems if you click the cached link, it will provide some info at the top, like this:

(using my earlier example of db.view)

Every time I've found a result that was missing a word I typed, or in this case it changing what I searched for, it's using info from pages that link to the result.

Now if only I could find a setting to turn this behavior off, I'd be happy. Really annoying to put in a 6 word search, and have it return results that only contain 5 of the words, due to the sixth being on some other linked page.