Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
thanh chau » thanh cha, thanh cham, thanh chu
hieu manh » chieu xanh, dieu hanh, hien hanh
canh tinh » hanh tinh, manh tinh, canh tranh
ha thong » hoa thong, nha thong, he thong
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
tinh ha » tinh hai, tinh hoa, tinh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (hieu nganh)) - canh tinh ha thong ((cong ban) OR (cong san)) thanh chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - canh tinh ha thong ((cong ban) OR (cong san)) thanh chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu nganh)) - canh tinh ha thong ((cong ban) OR (cong san)) thanh chau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu nganh)) - canh tinh ha thong ((cong ban) OR (cong san)) thanh chau*.