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There is no easy answer other than manual inspection of results.
I am afraid you are falling foul of the fact that servers do not store metadata in any consistent way in the first place. It can vary between books by the same author and publisher. It also depends for each book on what they have decided are search terms. That is why (as you have found) passing less information from Calibre often gives better results as if you provide too much and it does not match what the server has stored for that book it can erroneosly decide it is not a match.
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