You can check for multiple keywords in a string using Regular Expression matching in the Functions:Text Thing.
Select 'Continue flow if text matches a regular expression'. That way you can check for well over 10 keywords at the same time, using the regex OR feature - the pipe symbol: |
Note: If you happen to check the app's Activity log, it will show when the flow found a match. But if there was no match, the log will say an error occurred. It doesn't mean there is something wrong with the flow, the Activities log always shows an error on non-matches.