Perhaps you should try some spelling variations:
delle studien » duale studien, delphi studien, modell studien
e literatura » de literatura, y literatura, a literatura
e filosofia » la filosofia
tesi delle » testi delle, test delle, testi della
studien e » studien es, studien _, studien 3
literatura » literaturea
literatur » literature

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: "tesi delle studien e filosofia ((e literatura) OR (e literatur))".
• Adding a wildcard symbol may retrieve word variants: tesi delle studien e filosofia ((e literatura) OR (e literatur))*.