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 » khong cang, chong cong, khong con
thong cong » trong cong, tong cong, thong thong
hanh dung » thanh dung, anh dung, hanh dong
dung cua » dung luan, dung cho
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

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