Perhaps you should try some spelling variations:
duale studien » duale studium, scale studien, duales studium
filosofia da » filosofia del, filosofia e, filosofia della
filosofia de » filosofia del
test duale » test double, test delle, test orale
studien e » studien es, studien _, studien 3

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 duale studien e ((filosofia da) OR (filosofia de)) literature*".