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 » studies ds, studie das, studien das
test five » test file, test files, least 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: "test five studies das filosofia ((en litterature) OR (et litterature))".
• Adding a wildcard symbol may retrieve word variants: test five studies das filosofia ((en litterature) OR (et litterature))*.