Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
khong cong » thong cong, khong cang, chong cong
hanh dung » thanh dung, anh dung, hanh dong
ha khong » hoa khong, hay khong, hua khong
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan
dung ha » dung va, dung he, dung khoa

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