I have gone through the data and it has the column for English and Thai versions. I think the Thai language font was not attached along with the data sent by you. So, it appears as a symbol instead of the Thai language.
Probably, if you can send Thai specific font for viewing, it really helps us to appreciate your product.
Also, I have enclosed a sample location (refer kmz file) and by chance is it possible to provide your sample for this location?
As we are validating it using this area, it may really help.
Looking forward to hear from you to get the required Thai specific font plus sample of our AOI.