Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
quang dung » quang trung, ung dung, cuong dung
hieu manh » chieu xanh, hieu nganh, dieu hanh
canh tinh » hanh tinh, manh tinh, canh tranh
dung cong » dung trong
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chieu sang)) - canh tinh quang dung cong ((tan toan) OR (tap toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sang)) - canh tinh quang dung cong ((tan toan) or (tap toan)) cau*.