Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
trinh toan » tinh toan, thanh toan, trinh quan
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
trinh han » trinh quan
cua dung » cua dang, cua dong, qua dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - ((hanh trang) OR (hanh trinh)) cua dung cong ((trinh toan) or (trinh han)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh trang) OR (hanh trinh)) cua dung cong ((trinh toan) OR (trinh han)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh trang) OR (hanh trinh)) cua dung cong ((trinh toan) or (trinh han)) cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((hanh trang) OR (hanh trinh)) cua dung cong ((trinh toan) or (trinh han)) cau*.