Hi @Lwsamcn,
How to add multiple words into the filter of mail rule?
The relationship of words(phrases) is AND(coordinating).
I am afraid this is currently not feasible. It's by design that only the OR condition is supported at present in this scenario.
If you only need to include two words/phrases, a possible workaround is to select "This subject or body matches these text patterns" for the other key word/phrase and check the result:
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