Perhaps you should try some spelling variations:
duales studium » das studium
filosofia da » filosofia de, filosofia del, filosofia e
test duales » test doubles, test rules, test oracles
filosofia a » filosofia la, filosofia e, filosofia _
studium dd » studium ad, studium d, studium der

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 duales studium dd ((filosofia a) OR (filosofia da)) literature*".