Solution: Put the fragment of the filename in quotes, and viola, there is your file.
Why should you have to put it in quotes you ask? Why wouldn't it automatically default to putting everything in quotes itself, you ask? Why isn't it more user friendly? Well the answer is apparently embedded in the logic sourced in this document.
Let me know, when you have memorized that document, and can explain this is layman's terms. Until then, let's see if you and I are the only two people who have ever experienced any issue with Spotlight. The comments (or lack thereof) should be very telling.
Hope that helps.