Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu nganh » vien nganh, nghiep nganh
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, dieu hanh, hien hanh
hiem ngan » kim ngan, viem gan
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu nganh) OR (hieu manh))) OR (hiem ngan)) - thanh trung cua thong cong san than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hieu nganh) OR (hieu manh))) or (hiem ngan)) - thanh trung cua thong cong san than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu nganh) OR (hieu manh))) or (hiem ngan)) - thanh trung cua thong cong san than cau*.