Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
va phuong » va thuong, cac phuong
ban thanh » ban hanh, ban hang
tranh va » tranh van, trang va, trinh va
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: theo ((chieu sang) OR (chieu xanh)) - canh tranh va phuong cong ((van toan) OR (ban thanh)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) OR (chieu xanh)) - canh tranh va phuong cong ((van toan) or (ban thanh)) ban~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) OR (chieu xanh)) - canh tranh va phuong cong ((van toan) or (ban thanh)) ban*.