Perhaps you should try some spelling variations:
del literature » model literature, abel literature, fuel literature
e filosofia » la filosofia
1 studium » 10 studium, 2 studium, 1 stadium
_ studium » im studium

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((1 studium) OR (_ studium)) e filosofia del literature".
• Adding a wildcard symbol may retrieve word variants: test ((1 studium) OR (_ studium)) e filosofia del literature*.