Perhaps you should try some spelling variations:
thanh hoa » thanh pho
ban thanh » ban hanh, ban hang
cham duc » pham duy, phan duc, cham cuu
su sach » so sach, vu sach
hoa cua » hoa chat, hoa xuat
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang xa hoi. hieu ve ((((cham duc) OR (cham soc))) or (pham duc)) ban thanh hoa cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang xa hoi. hieu ve ((((cham duc) OR (cham soc))) OR (pham duc)) ban thanh hoa cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang xa hoi. hieu ve ((((cham duc) OR (cham soc))) or (pham duc)) ban thanh hoa cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang xa hoi. hieu ve ((((cham duc) OR (cham soc))) or (pham duc)) ban thanh hoa cua tre*.