Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
quan nhung » cua nhung, luan chung, quang hung
hieu manh » chieu xanh, dieu hanh, hien hanh
manh tung » manh hung, thanh tung
qua nhung » cua nhung, qua chung, chua nhung
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) OR (hieu nganh)) - manh tung ((quan nhung) or (qua nhung)) cong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (hieu nganh)) - manh tung ((quan nhung) OR (qua nhung)) cong san toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (hieu nganh)) - manh tung ((quan nhung) or (qua nhung)) cong san toan tap".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (hieu nganh)) - manh tung ((quan nhung) or (qua nhung)) cong san toan tap*.