A quick update on this for anyone reading this thread.
Although putting double quotes round the subject search term works, after
further investigation, it looks like the technique to use is to remove the
double hyphen, i.e.,
su:Library science Humor
The bug seems limited to subjects with a double hyphen in them, and this
seems to be the way WorldCat itself submits a search when clicking on a
subject with a double hyphen in it.
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