Perhaps you should try some spelling variations:
delle studien » delphi studien, modell studien, welche studien
duale studien » duale studium, scale studien, duales studium
die filosofia » di filosofia, de filosofia, e filosofia
y literatura » la literatura
filosofia y » filosofia e, filosofia _, filosofia de

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)) die filosofia y literatura".
• Adding a wildcard symbol may retrieve word variants: test ((delle studien) OR (duale studien)) die filosofia y literatura*.