Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ca » thanh cha, thanh cac, thanh ha
duoc ban » duc ban, quoc ban, buoc ban
sang tao » hang tai
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
sang ma » tang ma, nang ma, mang may
va nay » va ngay, va cay
ca cua » co cua
va nam » van nam, ha nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky ((sang ma) OR (sang tao)) hoi. lieu ((va nam) or (va nay)) duoc ban thanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky ((sang ma) OR (sang tao)) hoi. lieu ((va nam) OR (va nay)) duoc ban thanh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky ((sang ma) OR (sang tao)) hoi. lieu ((va nam) or (va nay)) duoc ban thanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: co sach ky ((sang ma) OR (sang tao)) hoi. lieu ((va nam) or (va nay)) duoc ban thanh ca cua tre*.