Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, hanh trinh, minh trang
thong cong » trong cong, tong cong, thong thong
cua thong » cua thuong, cua khong, cua tong
ho chieu » theo chieu, hoc thieu, doi chieu
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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 trang) OR (canh tranh)) cua thong cong ((tac toan) or (tam toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - ((hanh trang) OR (canh tranh)) cua thong cong ((tac toan) OR (tam toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - ((hanh trang) OR (canh tranh)) cua thong cong ((tac toan) or (tam toan)) cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - ((hanh trang) OR (canh tranh)) cua thong cong ((tac toan) or (tam toan)) cao*.