Perhaps you should try some spelling variations:
sach tham » sach nha
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
xang xa » mang xa, ang xa, dang xay
cua tre » cua te, cuu tre, cua triet
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di 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: so sach tham ((xang xa) OR (lang xa)) hoi. hieu van cau ((xac va) OR (tuc va)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tham ((xang xa) OR (lang xa)) hoi. hieu van cau ((xac va) or (tuc va)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: so sach tham ((xang xa) OR (lang xa)) hoi. hieu van cau ((xac va) or (tuc va)) hanh vi cua tre*.