Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, hieu lang
vat dung » van dung, viet dung, mat duong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
va dung » van dung, va duong, va ung

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 tinh) or (chieu sang)) - canh tranh ((va dung) or (vat dung)) cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu tinh) OR (chieu sang)) - canh tranh ((va dung) OR (vat dung)) cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) or (chieu sang)) - canh tranh ((va dung) or (vat dung)) cong tac toan tap*.