Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
cuong dung » tuong duong, ung dung
thong dung » thong cong, thong thuong
canh tinh » hanh tinh, manh tinh, canh tranh
ho chieu » theo chieu, hoc thieu, doi chieu
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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 - canh tinh ((cuong dung) OR (thong dung)) cong ((tan toan) OR (tap toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - canh tinh ((cuong dung) OR (thong dung)) cong ((tan toan) or (tap toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - canh tinh ((cuong dung) OR (thong dung)) cong ((tan toan) or (tap toan)) cau*.