Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tai cuc, tri cua
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
sang ma » nang ma, sang tao, mang may
va ca » va cao, va cai, va cau

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 ((sang ma) or (tang ma)) hoa. hieu ((va ca) OR (va cac)) dua ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang ma) OR (tang ma)) hoa. hieu ((va ca) OR (va cac)) dua ban thanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((sang ma) or (tang ma)) hoa. hieu ((va ca) OR (va cac)) dua ban thanh tai cua tre*".