Perhaps you should try some spelling variations:
delphi studien » delphi studie, delphi study
delle studien » duale studien, modell studien, die studien
der filosofia » de filosofia, e filosofia, di filosofia
le literatura » la literatura, de literatura, e literatura
filosofia le » filosofia de, filosofia e, filosofia del

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 ((delle studien) OR (delphi studien)) der filosofia le literatura".
• Adding a wildcard symbol may retrieve word variants: test ((delle studien) OR (delphi studien)) der filosofia le literatura*.