Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
chu bang » thu bang, chuc nang, chu quang
cong dan » cong san, cong tan, cong dong
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 trinh)) chu bang ((cong dan) or (huong dan)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((hanh tranh) OR (hanh trinh)) chu bang ((cong dan) OR (huong dan)) than cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((hanh tranh) or (hanh trinh)) chu bang ((cong dan) or (huong dan)) than cao*.