Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hang tai » hang va, dung tai
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, qua ban, mua ban
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau

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 ((mang may) OR (hang tai)) hoa. hieu va cau ((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 ((mang may) or (hang tai)) hoa. hieu va cau ((dua ban) OR (cua ban)) thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang may) or (hang tai)) hoa. hieu va cau ((dua ban) OR (cua ban)) thanh vai cua tre*.