Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
hoac khong » hoa khong, hoc khong, hay khong
khong cong » thong cong, khong cang, chong cong
doi chieu » doc hieu, doi chi, ho chieu
tung hoac » trung hoc, trung hoa, dung hoc
cong dan » cong san, cong tan, huong dan
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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 hoac khong cong dan ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh tung hoac khong cong dan ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh tung hoac khong cong dan ((than cau) or (phan cau))*.