Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, qua ban, mua ban
sach ky » sach y, sach ty, sach kem
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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 (sac ky)) tang ma hoa. hieu van cam ((dua ban) OR (cua ban)) thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) tang ma hoa. hieu van cam ((dua ban) OR (cua ban)) thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) tang ma hoa. hieu van cam ((dua ban) OR (cua ban)) thanh vai cua tre*.