Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
qua cham » qua hai, qua cac, va cham
hanh hoi » hanh thoi, hanh noi, hanh hoa
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
soc van » hoc van, sac van, soc dan
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
oc van » hoc van, luoc van, quoc van

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: tu sach hoi ((nang xa) OR (nang x)) hoi. hieu qua cham ((soc van) OR (oc van)) hanh hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoi ((nang xa) OR (nang x)) hoi. hieu qua cham ((soc van) or (oc van)) hanh hoi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach hoi ((nang xa) OR (nang x)) hoi. hieu qua cham ((soc van) or (oc van)) hanh hoi cua tre*.