Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, nhieu tang
hanh huong » thanh huong, anh huong, manh huong
hieu lang » nhieu tang, hieu van, biet lang
huong cua » dung cua
dang cong » dung cong
cua dang » cua cong, cua ban
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran cau » tran chau, toan cau, ran 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) OR (hieu quang)))) - hanh huong cua dang cong tac tran cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (((hieu lang) OR (hieu quang)))) - hanh huong cua dang cong tac tran cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (((hieu lang) OR (hieu quang)))) - hanh huong cua dang cong tac tran cau*.