Perhaps you should try some spelling variations:
khong xuong » khong dung, hong vuong, thong duong
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
hanh dung » thanh dung, anh dung, hanh dong
cho khong » chu khong, nho khong, khoi khong
tai toan » bai toan, tai tuan, tam toan
tap toan » tap doan, tap quan, bai toan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu xanh) or (chieu sach)) - hanh dung cho khong xuong ((tai toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sach)) - hanh dung cho khong xuong ((tai toan) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (chieu sach)) - hanh dung cho khong xuong ((tai toan) OR (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chieu sach)) - hanh dung cho khong xuong ((tai toan) OR (tap toan)) cau*.