Perhaps you should try some spelling variations:
delphi studien » delphi studie, delphi study
filosofica da » filosofia da, filosofia de, filosofia di
belts delphi » bei delphi, parts delphi
filosofia la » filosofia da, filosofia le, filosofia das
studien aus » studie aus

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: "belts delphi studien aus ((filosofia la) OR (filosofica da)) literatura*".