Hi,
I’m afraid that is not possible. The comparision for the input phrase is text based, so it would have to first translate to multiple languages, and then do the comparision for all of them until it gets a match – and that would probably take a lot of time and processing power as well.
Therefore I’m afraid I can’t recommend any custom code to maybe do this somehow, as this is a much more complicated issue.
You can however use the synonyms feature. If you know some keywords are commonly typed in different language, then you can add them as synonyms. Then searching the synonym keywords will match the originals.