Perhaps you should try some spelling variations:
luan trong » quan trong, luat trong, luan tuong
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tong » hanh trong, han tong, hanh dong
tong luan » tang luan, dung luan, hang luan
hieu van » hieu va, thien van, lieu va
cong ban » cong bang, cong san, cong tan
ban hang » ngan hang
hang cau » hang dau, hang ca, nhung cau

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 van)) - hanh tong luan trong cong ban hang cau~.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu van)) - hanh tong luan trong cong ban hang cau*.