Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
chuan trang » xuan trang, chu trang, nhuan trong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan

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 - thanh trong ((van ban) or (chuan trang)) cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trong ((van ban) OR (chuan trang)) cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trong ((van ban) or (chuan trang)) cong dan toan ban*.