Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh tung » thanh cong
hieu lang » hieu quang, nhieu tang, hieu van
cua thong » cua thuong, cua khong, cua tong
cua dong » chua dong, cua cong, cua dang
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: doi ((chieu sang) or (hieu lang)) - thanh tung ((cua thong) or (cua dong)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - thanh tung ((cua thong) OR (cua dong)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - thanh tung ((cua thong) or (cua dong)) cong tac toan cau*.