Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
hien hanh » dieu hanh
trung va » truong va, trang va, trung ha
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, 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 ((thieu sach) or (hien hanh)) - thanh trung va nhung ((cong ban) or (cong tan)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hien hanh)) - thanh trung va nhung ((cong ban) OR (cong tan)) than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hien hanh)) - thanh trung va nhung ((cong ban) or (cong tan)) than cau*.