Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
luan trong » quan trong, luat trong, luan tuong
hieu lang » hieu quang, nhieu tang, hieu van
hanh dung » thanh dung, anh dung, hanh dong
nhung cau » chung cu, nhung bai, nhu cau
cong ban » cong bang, cong san, cong tan
hang cau » hang dau, hang ca, nang cao

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)) - hanh dung luan trong cong ban ((hang cau) OR (nhung cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - hanh dung luan trong cong ban ((hang cau) OR (nhung cau))~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - hanh dung luan trong cong ban ((hang cau) OR (nhung cau))*.