Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
dung cong » dung trong
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap
nang su » nang du, nang tu, nang suat

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: theo ((chieu xanh) OR (chieu sang)) - hanh ((nang su) OR (dang su)) dung cong san than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (chieu sang)) - hanh ((nang su) OR (dang su)) dung cong san than cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chieu sang)) - hanh ((nang su) OR (dang su)) dung cong san than cau*.