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

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