Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
thanh chau » thanh cha, thanh cham, thanh chu
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung tuan, trung cap
thanh lap » thanh san, phan lap, thanh hai
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung cua ban ((cong tan) OR (cong san)) ((thanh chau) OR (thanh lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - thanh trung cua ban ((cong tan) OR (cong san)) ((thanh chau) or (thanh lap))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung cua ban ((cong tan) OR (cong san)) ((thanh chau) or (thanh lap))*.