Perhaps you should try some spelling variations:
et litterature » la litterature, art literature
en litterature » une litterature, la litterature, de litterature
das filosofia » da filosofia, la filosofia, di filosofia
five studies » wave studies, five stories, native studies
studies das » studie das, studien das, studies data
least five » last five, least fixed, past five

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

• If you are trying to use Boolean operators, they must be ALL CAPS: least five studies das filosofia ((en litterature) OR (et litterature)).
• Adding a wildcard symbol may retrieve word variants: least five studies das filosofia ((en litterature) or (et litterature))*.