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
pham duy » pham duc
tai cua » thai cua, tai cuc, tri cua
duy ban » uy ban, duy van, duy can
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van

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) OR (hieu qua)) pham duy 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) OR (hieu qua)) pham duy 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) OR (hieu qua)) pham duy ban thanh tai cua tre*".