Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
rules studium » duales studium, rules studying, als studium
furs studium » fur studium, das studium, und studium
i filosofia » di filosofia, e filosofia, a filosofia

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 ((rules studium) OR (furs studium)) i filosofia del litterature".
• Adding a wildcard symbol may retrieve word variants: test ((rules studium) OR (furs studium)) i filosofia del litterature*.