Perhaps you should try some spelling variations:
del literature » model literature, abel literature, fuel literature
die filosofia » di filosofia, e filosofia, da filosofia
de filosofia » e filosofia, di filosofia, la filosofia
i studium » im studium, ii studium, iv studium
test i » test ii, test 1

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 ((die filosofia) OR (de filosofia)) del literature".
• Adding a wildcard symbol may retrieve word variants: test i studium ((die filosofia) OR (de filosofia)) del literature*.