Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu quang » thieu quang, hieu quan, hieu qua
tranh cua » doanh cua, manh cua
dang cong » dung cong
cua dang » cua cong, cua ban
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 xanh) OR (hieu quang)) - canh tranh cua dang cong ((dan toan) OR (van toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (hieu quang)) - canh tranh cua dang cong ((dan toan) OR (van toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (hieu quang)) - canh tranh cua dang cong ((dan toan) OR (van toan)) cao*.