Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
vai cua » dai cua, hai cua, lai cua
qua ban » cua ban, qua quan
cay qua » cau qua, cac qua, cay lua
van cay » van cau, van bay, van ca
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
hang ma » hang ca, tang ma, nang ma

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 (sach thu)) ((hang ma) OR (hang va)) hoa. hieu van cay qua ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) ((hang ma) OR (hang va)) hoa. hieu van cay qua ban thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) ((hang ma) OR (hang va)) hoa. hieu van cay qua ban thanh vai cua tre*".