Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
van hac » van hoc, van ha, van hai
hac cac » thac cac, hoc cac, hay cac
cac van » cac dan
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach vay
sach 2 » sach y
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: thu ((sach v) or (sach 2)) nang x hoi. hieu van hac cac van thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach v) OR (sach 2)) nang x hoi. hieu van hac cac van thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach v) or (sach 2)) nang x hoi. hieu van hac cac van thanh dai cua tre*.