It depends ...
Virtual Libraries are used when you want to restrict. As in my idea.
But if you want a wider search, set Tag Browser to Match any. Create VL based on *current search. Then, in the VL, be more specific.
Of course, to show/use it to the best, you need an enormous number of books, with a LOT of tags. If you are British think British Library, if you are American think Library of Congress.
Then, use the following, in any order/combination/repetition:
Match any
Match all
Single-select
Multi-select
Create Virtual Library from *current search.
It might take years of training to get the combination correct if you work at a national library, but the possibilities are endless...
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