Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
van chay » van chat, san chay, toan chay
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
sach ky » sac ky, sach ty, sach kem
tang ma » tang van
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) ((tang ma) OR (mang may)) hoa. hieu van chay dua ban thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) ((tang ma) OR (mang may)) hoa. hieu van chay dua ban thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) ((tang ma) OR (mang may)) hoa. hieu van chay dua ban thanh vai cua tre*.