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 tong » hanh trong, han tong, hanh dong
tong luan » tang luan, dung luan, hang luan
cong ban » cong bang, cong san, cong tan
hang cau » hang dau, hang ca, nhung cau
hang tai » hang va, dung 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 tong luan trong cong ban ((hang cau) OR (hang tai))~.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - hanh tong luan trong cong ban ((hang cau) or (hang tai))*.