Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thien van » thi van
va thanh » gia thanh, ban thanh, va tinh
sach kem » hanh kem
dat duoc » dat nuoc, da duoc, luat duoc
sach hay » sach han, sach ha, sach nay
duoc va » nuoc va, duc va, duoc ma
van dat » van dao, van dau, dan dat
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
o hoc » co hoc, mo hoc, so hoc

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 hay) OR (sach kem))) OR (sac ky)) nang o hoc. thien van dat duoc va thanh dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach hay) or (sach kem))) or (sac ky)) nang o hoc. thien van dat duoc va thanh dai cua tre*.