Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
sach tu » sach thu, cach tu, sach ty
van cua » vang cua, ban cua, dan cua
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van
va cao » va cac, va co, va dao
va cai » va cac, va bai, va dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tu ((tang ma) or (lang xa)) hoi. hieu ((va cai) or (va cao)) duc ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu ((tang ma) OR (lang xa)) hoi. hieu ((va cai) OR (va cao)) duc ban thanh van cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach tu ((tang ma) or (lang xa)) hoi. hieu ((va cai) or (va cao)) duc ban thanh van cua tre*.