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