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 hang » dang hoang, dang hung, dang hanh
ho chieu » theo chieu, hoc thieu, doi chieu
han dang » phan dang, nhan dang, chan dang
bai toan » bai tap
va toan » van toan, tap toan, va 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 hang ((va toan) OR (bai toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh trinh han dang hang ((va toan) OR (bai toan)) tap".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh trinh han dang hang ((va toan) OR (bai toan)) tap*.