Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong thanh » dong thanh, cong trinh, truong thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cua » truong cua, trung tuan, trung cap
doc hieu » toc thieu, hoc thieu, hoc hien
cua dang » cua cong, cua ban
cong tan » cong tac, cong san, cong ty
tcan cau » toan cau, toan cao, van cau
can cau » van cau, ban cau, ca 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 cua dang ((cong tan) or (cong thanh)) ((tcan cau) or (can cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trung cua dang ((cong tan) OR (cong thanh)) ((tcan cau) OR (can cau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trung cua dang ((cong tan) or (cong thanh)) ((tcan cau) or (can cau))*.