Perhaps you should try some spelling variations:
doanh nhung » doanh chung, doanh thuong, doanh nhan
canh nhung » anh nhung, hanh nhung, tranh nhung
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tram » hanh tam, hanh trang, thanh tran
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu
san toan » van toan, dan toan, xuan toan

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