Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
cau duc » cao duc, cau luc, chu duc
va danh » va dinh, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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