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If I understand correctly, you want it to find all books that have both Tag A and Tag B, right? e.g. if they have Tag A but not Tag B, they won't pass the filter.
If this is the case, you can set up the tag browser to use an "All" style search rather than an "Any" style search. Press the "Alter Tag Browser" button at the bottom of the tag browser, then go to "Search type when selecting multiple items" and choose "Match all of the items".
Now you can shift-click on multiple tags to find items that have all the tags.
I generally find this more useful than "Any" searches, so I leave my tag browser like this by default, switching to the other type on the occasions when I need it, then switching back.
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