Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van bac » van ban, van bao, van hac
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v 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 y nang x hoi. hieu van bac duc ban thanh dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van bac duc ban thanh dai cua tre*.