Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
va tham » van tham, va thanh, va thuat
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
va cham » va chat
sach tu » sach thu, cach tu, sach ty
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet

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 cham) OR (va tham)) duc ban thanh tai 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 cham) OR (va tham)) duc ban thanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tu ((tang ma) or (lang xa)) hoi. hieu ((va cham) OR (va tham)) duc ban thanh tai cua tre*".