Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien hanh » dieu hanh
cua thong » cua thuong, cua khong, cua tong
hua khong » hoa khong, cua khong, hoac khong
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - thanh trung ((cua thong) or (hua khong)) cong tan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - thanh trung ((cua thong) OR (hua khong)) cong tan phan dau.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - thanh trung ((cua thong) or (hua khong)) cong tan phan dau*.