Perhaps you should try some spelling variations:
tieng manh » tieng anh, tien manh, tieng han
trung tran » trung tuan, trung thanh, trung tam
hoc tieng » hoc hien
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 manh - thanh ((trung tran) or (tran quang)) dung cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tieng manh - thanh ((trung tran) OR (tran quang)) dung cong dan than cao.
• Adding a wildcard symbol may retrieve word variants: hoc tieng manh - thanh ((trung tran) or (tran quang)) dung cong dan than cao*.