Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung thanh » truong thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
chan cau » phan cau, can cau, chinh cau

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 trung thanh cong ((cong dan) or (cong tan)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trung thanh cong ((cong dan) OR (cong tan)) chan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trung thanh cong ((cong dan) or (cong tan)) chan cau*.