Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cac » nhan cach, phan dau, phan lap

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 ((chieu sang) OR (hieu lang)) - canh tranh ((cua dung) OR (cua dong)) cong tan phan cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - canh tranh ((cua dung) OR (cua dong)) cong tan phan cac~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - canh tranh ((cua dung) OR (cua dong)) cong tan phan cac*.