Why can't dash search find a program by its full name?

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http://askubuntu.com – For some applications, dash search comes up empty when searching by the application's full name. When typing the first couple of letters, it works. I wonder why... MuseScore is a fine example. When I search for "muse" in the dash search, MuseScore is found. When I search for "musescore", nothing is found. This behavior makes me distrustful of the dash search... I wonder how often it misses installed programs... I like to be able to trust the software tools I'm using. (HowTos)