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
cong bang » cuong bang, dong bang, hong bang
tranh he » trinh he, tranh ha, tinh he
cong ban » cong san, cong tan, cong dan
he tong » he thong, he trong, he cong

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 tranh he tong ((cong ban) OR (cong bang)) thanh chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - canh tranh he tong ((cong ban) OR (cong bang)) thanh chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu nganh)) - canh tranh he tong ((cong ban) OR (cong bang)) thanh chau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu nganh)) - canh tranh he tong ((cong ban) OR (cong bang)) thanh chau*.