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It appears that they return anything that matches any of the ‘search terms’, and that placing quotes around two words does not combine them into one search term. If the logic were that both (or all) terms needed to match, it could render the search ‘brittle’ should one of those be misspelled. And it probably does not merit an implementation that requires user to disambiguate by typing ‘Mark AND Twain’ or ‘Mark OR Twain’.
I have run into similar issues with Search in the iOS app, and it seemed the trouble must be with the metadata. For example, I have several books by Mo Yan. Neither ‘Mo yan’ nor ‘yan mo’ Find the books in my library, only books in Kindle Store. I have to type ‘yan,’ (With comma).
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