.3.1 Primary Data
The researcher methodology is a survey using questionnaires to exchange students from Cambodia. The researcher studies on July and August 2015 only.
3.3.2 Secondary Data
This information is gathering from relevant ideas, theories and researches for completely the scope of this research. The researcher can compile secondary data from the article from books and researches from Rajamangala University of Technology PhraNakhon, University of Chiang Mai, Kasetsart University and Internet.