Perhaps you should try some spelling variations:
trung tuan » trung thanh, tran tuan, truong thanh
hoc tieng » hoc hien
tieng han » tieng anh
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tieng han - thanh ((trung tam) or (trung tuan)) dung cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tieng han - thanh ((trung tam) OR (trung tuan)) dung cong dan than cao.
• Adding a wildcard symbol may retrieve word variants: hoc tieng han - thanh ((trung tam) or (trung tuan)) dung cong dan than cao*.