Perhaps you should try some spelling variations:
science theories » science theory, science three
science stories » science studies, science series
e morale » de morale, et morale, la morale
_ morale » _ moral, _ morals, la morale

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: biblioteca di ((science stories) OR (science theories)) ((e morale) OR (_ morale)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "biblioteca di ((science stories) or (science theories)) ((e morale) OR (_ morale))".
• Adding a wildcard symbol may retrieve word variants: biblioteca di ((science stories) or (science theories)) ((e morale) OR (_ morale))*.