Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
cham luc » cham soc, nhan luc, cham cuu
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
ang xa » lang xa, mang xa, dang xay
luc va » duc va, tuc va, loc va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) y ang xa hoi. ((hieu ve) OR (hieu va)) cham luc va thanh hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) y ang xa hoi. ((hieu ve) or (hieu va)) cham luc va thanh hoi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) y ang xa hoi. ((hieu ve) or (hieu va)) cham luc va thanh hoi cua tre*.