Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
tong cong » trong cong, cong cong, dung cong
cua tinh » cua sinh, va tinh, ha tinh
tam tong » tai tong, tam nong, tam song
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: hoc ((chieu sach) or (cua tinh)) - hanh trung tam tong cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (cua tinh)) - hanh trung tam tong cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (cua tinh)) - hanh trung tam tong cong tac toan cau*.