Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
duong cong » dung cong, luong cong, duong trong
tam duong » tam huong, tuan duong, thao duong
cong dang » cong dong, cong dan, cong dung
dang toan » dang tran, dan toan, dung toan
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: hoc ((chieu sang) or (chinh sach)) - thanh trung tam duong cong dang toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chinh sach)) - thanh trung tam duong cong dang toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chinh sach)) - thanh trung tam duong cong dang toan cau*.