I just have got a reply from my friend. She seemed unpleasant to do so, and in this case, I felt sorry to say that they did not want to deal with this again after I tried to explain what you want them to do so. They also called me and said that they did not want the money. :(
So bad I could not help you with this task. You maybe ask for help from someone in Thailand, I think. Below is the message from my friend. -->
Hope you understand what they are mentioned in the email. Do not blame them. This is the way foreigners speak, they say what they want to express.
All the best,
Tank
Dear Tank,
Thanks very much for your message. Both my colleague and I are busy these day, so we don't have the time to do more work other than what we have already done. If the researcher is thinking of having the work translated into Thai, I suggest the researcher use the original version and cite it properly as copyright infringement can be an issue.