Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
danh co » danh cho, doanh co, anh co
va danh » va dinh, va dan, va hanh
cao duc » dao duc, cao suc, giao duc
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
mang xa » lang xa, dang xay, mang cua
va cao » va cac, va co, va dao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((mang xa) OR (mang may)) hoi. hieu va cao duc va danh co ((cua tre) OR (cuu tre))~.
• Adding a wildcard symbol may retrieve word variants: so sach y ((mang xa) or (mang may)) hoi. hieu va cao duc va danh co ((cua tre) or (cuu tre))*.