Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
trinh han » trinh quan
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
han dang » phan dang, nhan dang, chan dang
dan toan » manh toan, xuan toan, dien toan
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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 trinh han dang cong ((((dan toan) OR (dan than))) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh trinh han dang cong ((((dan toan) OR (dan than))) OR (van toan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh trinh han dang cong ((((dan toan) OR (dan than))) or (van toan)) cau*".