Y'know, I would have thought so, too. But the substrings came up first, second, twenty-fifth...
There aren't many occurrences of the string in this project, and (I just realized) it doesn't occur in a topic title, which always gives it better ranking. So maybe ranking won't do the job for me in this case, even if it does work in others.
I did look in the RH8 help here on Adobe; if you don't have a magic search-defining character, I can take a closer look at John Daigle's tutorials.
Thank you, though. If I find one, I'll send it to you for your Snippets.