Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh tung » thanh cong
tien manh » tien anh, tien thanh, tieng anh
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
tran tap » toan tap, tran tan, tran tuan

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 manh) or (thien thanh)) - thanh tung cua dung ((cong tan) OR (cong san)) tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien manh) OR (thien thanh)) - thanh tung cua dung ((cong tan) OR (cong san)) tran tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien manh) or (thien thanh)) - thanh tung cua dung ((cong tan) OR (cong san)) tran tap*".