Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va cao » va cac, va co, va dao
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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: toc sach v nang x hoi. hieu va cao ((luc va) or (tuc va)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang x hoi. hieu va cao ((luc va) OR (tuc va)) thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach v nang x hoi. hieu va cao ((luc va) or (tuc va)) thanh dai cua tre*.