Perhaps you should try some spelling variations:
tien manh » tien anh, tien thanh, tieng anh
trung pha » trung phan, trung phat, truong phan
hoc tien » hoc tieng, hoc hien, hoc vien
trung ha » trung hoc, trung tam, trung cap
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cao » toan cao, thai cao, than cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien manh - thanh ((trung pha) OR (trung ha)) dang ((cong dan) OR (cong san)) than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tien manh - thanh ((trung pha) or (trung ha)) dang ((cong dan) OR (cong san)) than cao~".
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - thanh ((trung pha) or (trung ha)) dang ((cong dan) OR (cong san)) than cao*.