Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
dang mat » dang vat, dang mau, dang hat
dung mat » duong mat, dung dat, dung may
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, qua ban, mua ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
van ca » van cau, van cua, dan ca

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 ky ((dang mat) OR (dung mat)) hoa. hieu van ca ((dua ban) or (cua ban)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang mat) OR (dung mat)) hoa. hieu van ca ((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 ((dang mat) OR (dung mat)) hoa. hieu van ca ((dua ban) or (cua ban)) thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang mat) OR (dung mat)) hoa. hieu van ca ((dua ban) or (cua ban)) thanh vai cua tre*.