Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung cua » truong cua, trung tuan, trung cap
ho chieu » theo chieu, hoc thieu, doi chieu
cua tong » cua cong, cua dong, cua nong
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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: ho chieu sang - thanh trung cua tong ((cong tan) OR (cong tac)) ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - thanh trung cua tong ((cong tan) or (cong tac)) ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh trung cua tong ((cong tan) or (cong tac)) ((toan cau) OR (toan ban))*.