Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
dan ban » van ban, can ban, dan bac
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va cao » va cac, va co, va bao
dan ba » dan bac, dan ca, dan va
va dao » ca dao

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 thu nang xa hoi. hieu ((va cao) OR (va dao)) duc va ((dan ban) or (dan ba)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang xa hoi. hieu ((va cao) OR (va dao)) duc va ((dan ban) OR (dan ba)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang xa hoi. hieu ((va cao) OR (va dao)) duc va ((dan ban) or (dan ba)) ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang xa hoi. hieu ((va cao) OR (va dao)) duc va ((dan ban) or (dan ba)) ve triet*.