Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
doi chieu » doc hieu, doi chi, ho chieu
cua nhung » va nhung
tung cua » trung cua, tuong cua, dung cua
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - thanh tung cua nhung ((cong dan) or (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh tung cua nhung ((cong dan) OR (cong san)) than cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh tung cua nhung ((cong dan) or (cong san)) than cau*.