Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
te sach » toc sach
hieu ve » hieu va, hieu van
su viet » so viet
y sang » _ sang, duy sang
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac
sat su » dat su

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: te sach y sang ((ma hoi) OR (xa hoi)). hieu ve cac du ((va thanh) OR (ban thanh)) sat su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y sang ((ma hoi) or (xa hoi)). hieu ve cac du ((va thanh) OR (ban thanh)) sat su viet~".
• Adding a wildcard symbol may retrieve word variants: te sach y sang ((ma hoi) or (xa hoi)). hieu ve cac du ((va thanh) OR (ban thanh)) sat su viet*.