Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
truc van » truc va, thuc van, truc ban
so sach » so sanh, bo sach, co sach
hanh ve » hanh vi, hanh va
hieu ke » hieu kem, chieu ke, hieu ky
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
ke cau » ket cau

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 van ((nang xa) OR (nang x)) hoi. hieu ke cau truc van ((hanh ve) OR (hanh kem)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach van ((nang xa) or (nang x)) hoi. hieu ke cau truc van ((hanh ve) OR (hanh kem)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: so sach van ((nang xa) or (nang x)) hoi. hieu ke cau truc van ((hanh ve) OR (hanh kem)) cua tre*.