Perhaps you should try some spelling variations:
thanh trung » thanh tung
tien manh » tien thanh, tieng anh, tran manh
tien anh » tieng anh, dien anh, tien thanh
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan tap » toan ban
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien anh) OR (tien manh)) - thanh trung va hang ((cong tan) or (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (tien manh)) - thanh trung va hang ((cong tan) OR (cong san)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien anh) OR (tien manh)) - thanh trung va hang ((cong tan) or (cong san)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) OR (tien manh)) - thanh trung va hang ((cong tan) or (cong san)) toan tap*.