A few years ago I stumbled on a tool that was not dissimilar to calibre's Advanced Search with the added feature of a multi-term search-expression builder with not, and, and or operators, plus parentheses for bracketing terms.
At the time I made a mental note to send a message to chaley asking if something similar could be added to calibre's Advanced Search… which I promptly forgot about. I haven't been able to find that tool since, it may have been a digital asset manager or a database browser, it wasn't open source or anything like free.
BR
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