Perhaps you should try some spelling variations:
thanh hoa » thanh pho
ban thanh » ban hanh, ban hang
cham duc » cham soc, pham duy, phan duc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hoa cua » hoa chat, hoa xuat
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
tang xa » trang xa, tang ma, tang ha
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: so sach ky ((tang xa) OR (lang xa)) hoi. hieu ve ((cham duc) or (pham duc)) ban thanh hoa cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((tang xa) OR (lang xa)) hoi. hieu ve ((cham duc) OR (pham duc)) ban thanh hoa cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((tang xa) OR (lang xa)) hoi. hieu ve ((cham duc) or (pham duc)) ban thanh hoa cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((tang xa) OR (lang xa)) hoi. hieu ve ((cham duc) or (pham duc)) ban thanh hoa cua tre*.