Perhaps you should try some spelling variations:
five studies » wave studies, five stories, native studies
filosofia et » filosofia e, filosofia en, filosofia de
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 et) OR (filosofia del)) litterature*".