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
dung cong » dung trong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban
va dung » van dung, va duong, vat dung

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 trung) OR (thanh tung)) va dung cong tac toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((thanh trung) OR (thanh tung)) va dung cong tac toan ban*".