Perhaps you should try some spelling variations:
delle studien » delphi studien, modell studien, die studien
duale studien » duale studium, scale studien, duales studium
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 (duale studien)) der filosofia le literatura".
• Adding a wildcard symbol may retrieve word variants: test ((delle studien) OR (duale studien)) der filosofia le literatura*.