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