It means "Thank you very much".
* Akpo - This is a Gujarati word meaning "very".
* Bhi - This is a Hindi word meaning "also" or "too" (though it's often used in Gujarati as well).
* dhanayawad - This is the Gujarati word for "thank you".
So, the phrase literally translates to "very also thank you" in English, but the meaning is "thank you very much".