Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
hieu cac » hieu luc, hieu va, hieu van
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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: hoc ((hieu cac) or (hieu qua)) - hanh tranh cua nhung ((cong tan) or (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cac) OR (hieu qua)) - hanh tranh cua nhung ((cong tan) OR (cong san)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cac) or (hieu qua)) - hanh tranh cua nhung ((cong tan) or (cong san)) toan tap*.