Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu xanh » chieu sang, chieu tinh, hieu manh
thong cong » trong cong, tong cong, thong thong
cua thong » cua thuong, cua khong, cua tong
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan

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