Perhaps you should try some spelling variations:
delle studien » duale studien, delphi studien, modell studien
filosofia la » filosofia le, filosofica da, filosofia das
filosofia da » filosofia de, filosofia del, filosofia e
tesi delle » testi delle, test delle, testi della
studien 5 » studien _, studien 3, studien 4

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 5 ((filosofia la) OR (filosofia da)) literatura*".