How can I perform multi tags queries with namespace?

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2

If I understand your intention, one way could be this advanced query:

#+BEGIN_QUERY
{
  :query [
  :find (pull ?b [*])
  :where
    [?b :block/refs ?ref1]
    [?ref1 :block/name ?name1]
    [(clojure.string/includes? ?name1 "book")]
    [?b :block/refs ?ref2]
    [?ref2 :block/name ?name2]
    [(clojure.string/includes? ?name2 "python")]
  ]
}
#+END_QUERY
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