Perhaps you should try some spelling variations:
doanh nhung » doanh chung, doanh thuong, doanh nhan
hieu nganh » vien nganh, hiem ngan, nghiep nganh
canh nhung » anh nhung, hanh nhung, tranh nhung
hieu manh » chieu xanh, dieu hanh, hien hanh
hanh tran » hanh trang, thanh tran, hanh tram
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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