Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu xanh » chieu sang, chieu tinh, hieu manh
lanh chung » doanh chung, manh hung, luan chung
cua thuong » cua phuong, ca thuong, cua huong
cua truong » cua trung, xuan truong, cac truong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chieu xanh)) - lanh chung ((cua thuong) OR (cua truong)) cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu xanh)) - lanh chung ((cua thuong) OR (cua truong)) cong tap toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu xanh)) - lanh chung ((cua thuong) OR (cua truong)) cong tap toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu xanh)) - lanh chung ((cua thuong) OR (cua truong)) cong tap toan ban*.