Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
quang cong » quang cuong, quang dong, quang hoang
tam quang » lam quang, tac quang, tai quang
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (chieu sach)) - thanh trung tam quang cong san ((toan cau) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chieu sach)) - thanh trung tam quang cong san ((toan cau) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chieu sach)) - thanh trung tam quang cong san ((toan cau) or (van ban))*.