Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
thai hang » thai hoang, thi hang, thai bang
nam thang » nam thanh, nam trong, tam than
nam trung » nam trong, tai trung, ba trung
ho chieu » theo chieu, hoc thieu, doi chieu
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: ho chieu sach - hanh trung ((thai hang) or (((nam thang) OR (nam trung)))) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh trung ((thai hang) OR (((nam thang) OR (nam trung)))) cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh trung ((thai hang) or (((nam thang) OR (nam trung)))) cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh trung ((thai hang) or (((nam thang) OR (nam trung)))) cong tac toan cau*.