Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
tranh cua » doanh cua, manh cua
dung cong » dung trong
yen tinh » tuyen tinh
cua dung » cua dang, cua dong, qua dung
tam toan » tap toan, pham toan, tam thanh
tam than » ban than

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 (yen tinh)) - canh tranh cua dung cong ((tam toan) OR (tam than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (yen tinh)) - canh tranh cua dung cong ((tam toan) OR (tam than)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (yen tinh)) - canh tranh cua dung cong ((tam toan) OR (tam than)) cau*.