Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
cham duc » cham soc, pham duy, phan duc
su sach » so sach, vu sach
hoa cua » hoa chat, hoa xuat
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ty tang » tay tang, ty xang, ty hang

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