Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hanh tranh » canh tranh, hanh trinh, lanh tranh
hieu xanh » chieu xanh, hieu manh, hieu nganh
cua trong » cua truong, cua trung, qua trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cao » toan cao, thai cao, than cap

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 xanh - ((hanh tranh) or (hanh trang)) cua trong cong tan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((hanh tranh) OR (hanh trang)) cua trong cong tan than cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((hanh tranh) or (hanh trang)) cua trong cong tan than cao*.