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 khong » hua khong, cua phuong, cua thuong
ca thuong » cao thuong, cua thuong, va thuong
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
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 ((cua khong) or (ca thuong)) cong tac phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh tung ((cua khong) OR (ca thuong)) cong tac phan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh tung ((cua khong) or (ca thuong)) cong tac phan cau*.