Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cac cac » cac cach, ca cac, cac bac
cac van » cac dan
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) v nang x hoi. hieu va cac cac van thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) v nang x hoi. hieu va cac cac van thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) v nang x hoi. hieu va cac cac van thanh dai cua tre*.