Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, cong dong
toan cau » toan cao, toan tap, toan tai
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: doc hieu manh - canh tranh cua nhung ((cong dan) OR (huong dan)) ((toan cau) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - canh tranh cua nhung ((cong dan) or (huong dan)) ((toan cau) or (toan ban))*.