I recently experienced this limitation also. I was searching for multiple tags and wanted to save it as an overview. I am using multiple tags to further filter the search details / fields. But since this is not yet supported, I ended up having unecessary notes included.
I’d love to be able to search for something like "#due(tomorrow) @Bob but this doesn’t work. It just finds all notes with #due(tomorrow) regardless of whether @Bob is there too. Same thing if I try #Bob
I also tried the suggestion of “#due” “#Bob” but that just gives me any notes that say “due” or “Bob”, regardless of whether they are in a tag.