In this case, I would suggest using the Double Metaphone algorithm for MySQL. The double metaphone is designed to eliminate the difficulties associated with words from different root languages. It is based on Metaphone, which was designed to fix some of Soundex's flaws. Here is a link to the Double Metaphone website where you can learn more about this and also see examples in several languages, including MySQL:
http://www.atomodo.com/code/double-metaphone
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