Ran across a strong example of something I had previously suspected: library searches are particularly sensitive to character sets. (Mind you, I'm not sure there's an obvious fix, or even one needed, but it's a "be aware".)
I added a book I was looking for by ISBN (9781607747314), then downloaded metadata. (Amazon, Goodreads, Google, are my metadata sources.)
For the author, I got back "Marie Kondō"
Note the final character is not "o" but "ō"
Code:
Unicode character Oct Dec Hex HTML
ō latin small letter o with macron 0515 333 0x14D ō
Plugin search for books by this author did not return any results -- until I updated the ō to be an o, which is how Overdrive and 3M have the author.