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
tong cong » trong cong, cong cong, dung cong
san thanh » ban thanh, van thanh, son thanh
tranh he » tranh ha, tinh he, trang ha
trinh he » trinh han, trinh hoa, trinh thi
cong san » cong tac

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