Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. hieu van cac ((cac van) or (cac dan)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. hieu van cac ((cac van) OR (cac dan)) thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. hieu van cac ((cac van) or (cac dan)) thanh dai cua tre*.