Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » hieu va, thien van, lieu va
duoc ban » duc ban, quoc ban, buoc ban
sach ty » sach y, sach tu, sach thu
van lam » van nam
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, 5 hoi

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 ty) or (sac ky)) nang ((x hoi) OR (x ho)). hieu van lam duoc ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang ((x hoi) OR (x ho)). hieu van lam duoc ban thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sac ky)) nang ((x hoi) OR (x ho)). hieu van lam duoc ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang ((x hoi) OR (x ho)). hieu van lam duoc ban thanh vai cua tre*.