Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
thanh chau » thanh cha, thanh cham, thanh chu
hieu lang » chieu sang, hieu quang, nhieu tang
tan thanh » tran thanh, tang thanh, toan thanh
doc hieu » toc thieu, hoc thieu, hoc hien
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 ban) OR (cua cong)) cong tan thanh chau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - hanh tranh ((cua ban) OR (cua cong)) cong tan thanh chau".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh tranh ((cua ban) OR (cua cong)) cong tan thanh chau*.