Perhaps you should try some spelling variations:
en litterature » et litterature, une litterature, la litterature
das filosofia » da filosofia, la filosofia, a filosofia
five studies » wave studies, five stories, native studies
di filosofia » la filosofia, e filosofia
least five » last five, least fixed, past five

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: "least five studies ((das filosofia) OR (di filosofia)) en litterature".
• Adding a wildcard symbol may retrieve word variants: least five studies ((das filosofia) OR (di filosofia)) en litterature*.