This is about movies.SE but you can try this on other sites too, but it may not yield results.
gives over 300 results while the tag 1 has only 2 questions and I have seen only one question without tag some time ago. So the relevant results are only 1%.
Can this search be fixed please ?
In response to the answer: I am using Safari on iOS 12. Keyboard is English US, but I doubt that its punctuation layout changes.