Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
chieu xanh » chieu sach, chieu sang, chieu tinh
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan 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: hoc ((((thieu sang) or (thieu khang))) or (chieu xanh)) - canh tranh va dung cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thieu sang) OR (thieu khang))) OR (chieu xanh)) - canh tranh va dung cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((((thieu sang) or (thieu khang))) or (chieu xanh)) - canh tranh va dung cong tac toan tap*.