On math.meta, when I do a search for
cstheory I get several results, none of which is this one:
(The question is here.)
For it to find this question as well I have to search for
The help tips on searching include putting the text in quotes to get "an exact match" which suggests that without the quotes it matches on any old thing, and should find cstheory in the above.
Why is it unable to find that question?
(I suspect that it isn't found because the cstheory in that question does not have white space delimeters either before or after it, but that's only a guess.)