Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach le » cach le, sach de, sach lo
le mang » le tang, le manh, le dang
mang xa » lang xa, mang may, dang xay
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
hai van » thai van, ha van, hai tan
ve cao » va cao, ve bao, ve cac
hai va » thai va, hoi va, mai va

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 le mang xa hoi. hieu ve cao duc va hanh ((hai va) OR (hai van)) thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach le mang xa hoi. hieu ve cao duc va hanh ((hai va) OR (hai van)) thiet".
• Adding a wildcard symbol may retrieve word variants: su sach le mang xa hoi. hieu ve cao duc va hanh ((hai va) OR (hai van)) thiet*.