Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
sach thu » sach thue, sach thieu, sach tham
cham duc » pham duc, cham soc, pham duy
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
va cham » va chat, va tham
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach tu » cach tu, sach ty, sach uu
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) OR (sach thu)) ((tang ma) or (lang xa)) hoi. hieu va cham duc ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach tu) OR (sach thu)) ((tang ma) OR (lang xa)) hoi. hieu va cham duc ban thanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach tu) OR (sach thu)) ((tang ma) or (lang xa)) hoi. hieu va cham duc ban thanh tai cua tre*".