Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
xang xa » lang xa, mang xa, ang xa
nay duc » ngay doc
cua tre » cuu tre, cua triet, dua tren
va nay » va ngay, va cay
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (co sach)) ty xang xa hoi. lieu va nay duc va dan vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ty xang xa hoi. lieu va nay duc va dan vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ty xang xa hoi. lieu va nay duc va dan vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) ty xang xa hoi. lieu va nay duc va dan vi ((cua tre) or (cua te))*.