Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh dinh » thanh dinh, hinh dinh, hanh tinh
cong cong » cong dong, trong cong, dung cong
dinh cua » dinh cuu, sinh cua, dinh cu
tac toan » tap toan, tam toan, hach toan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu manh) or (chieu sach)) - hanh dinh cua cong cong ((tac toan) or (bai toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chieu sach)) - hanh dinh cua cong cong ((tac toan) OR (bai toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sach)) - hanh dinh cua cong cong ((tac toan) or (bai toan)) cau*.