Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
hoc chieu » hoc thieu, ho chieu, hoc hien
thai hang » thai hoang, thi hang, thai bang
nam trong » nam trung, cay trong
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 - hanh trung ((thai hang) or (nam trong)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh trung ((thai hang) OR (nam trong)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh trung ((thai hang) or (nam trong)) cong tac toan cau*.