Perhaps you should try some spelling variations:
del literature » model literature, abel literature, fuel literature
die filosofia » di filosofia, de filosofia, e filosofia
iv studium » im studium, ii studium, v studium
i studium » im studium, ii studium, vi 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 ((i studium) OR (iv studium)) die filosofia del literature".
• Adding a wildcard symbol may retrieve word variants: test ((i studium) OR (iv studium)) die filosofia del literature*.