Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
cua dang » cua cong
cong san » cong tac
san chat » van chat, san chay, ban chat
chat ban » nhat ban, chat ran, can ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (chieu xanh)) - thanh trung ((cua ban) or (cua dang)) cong san chat ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu xanh)) - thanh trung ((cua ban) OR (cua dang)) cong san chat ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu xanh)) - thanh trung ((cua ban) or (cua dang)) cong san chat ban*.