Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
quan trong » gian trong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tung quan » tuong quan, trung quan, dung quan
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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: toc ((chieu sang) OR (hieu manh)) - thanh tung quan trong cong san toan ban~.
• Adding a wildcard symbol may retrieve word variants: toc ((chieu sang) or (hieu manh)) - thanh tung quan trong cong san toan ban*.