You say you have a very good understanding of Thai culture, it is unlikely that there will be people in this category are English I speak a little . Write little hear do not understand at all.
You say you understand the culture, Thailand. Very unlikely that you will have these types of people in it. , I speak a little English Little written I do not understand
You say that you understand the culture. Great it is unbelievable that there are such people with I speak a little English. Write a little bit, listen to understand.