Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
chiet tach » chieu sach
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
anh quang » anh xquang, anh quan, nhanh quang
tung cong » dung cong, tong cong, truong cong
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 ((chiet tach) or (chieu sang)) - anh quang thanh tung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chiet tach) OR (chieu sang)) - anh quang thanh tung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chiet tach) or (chieu sang)) - anh quang thanh tung cong tac toan cau*.