Perhaps you should try some spelling variations:
su sach » so sach, vu sach
mang xa » lang xa, dang xay, mang cua
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
va danh » va dinh, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
va dan » ca dan, va dao, va dau
ca cua » co cua

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: su sach y ((mang xa) OR (mang may)) hoi. hieu va cao duc ((va danh) OR (va dan)) ca cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((mang xa) or (mang may)) hoi. hieu va cao duc ((va danh) OR (va dan)) ca cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach y ((mang xa) or (mang may)) hoi. hieu va cao duc ((va danh) OR (va dan)) ca cua tre*.