Perhaps you should try some spelling variations:
thanh chau » thanh cha, thanh cham, thanh chu
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
cong bang » cuong bang, dong bang, hong bang
doc hieu » toc thieu, hoc thieu, hoc hien
cua hang » cua dang, cua nhung, cua ban
cong tan » cong tac, cong san, cong thanh

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 lang - hanh tranh ((cua hang) OR (cua cong)) ((cong bang) or (cong tan)) thanh chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh tranh ((cua hang) OR (cua cong)) ((cong bang) OR (cong tan)) thanh chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - hanh tranh ((cua hang) OR (cua cong)) ((cong bang) or (cong tan)) thanh chau".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh tranh ((cua hang) OR (cua cong)) ((cong bang) or (cong tan)) thanh chau*.