Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
hiem ngan » kim ngan, viem gan
hien hanh » dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
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 ((hiem ngan) or (hien hanh)) - thanh trung cua thong cong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hiem ngan) OR (hien hanh)) - thanh trung cua thong cong ban than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hiem ngan) or (hien hanh)) - thanh trung cua thong cong ban than cau*.