Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van lam » van nam
lam cuu » lam chu, lam cua, cham cuu
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((kho tang) or (ky nang)) xa hoi. hieu van lam cuu ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((kho tang) OR (ky nang)) xa hoi. hieu van lam cuu ban thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((kho tang) or (ky nang)) xa hoi. hieu van lam cuu ban thanh dai cua tre*.