Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
huong cua » dung cua
cua nhung » va nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan tap
toan ban » van ban

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

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