Perhaps you should try some spelling variations:
filosofia de » filosofia del
de literatur » de literatura, de literatuur, de litterature
test duales » test doubles, test rules, test oracles
studium des » studium der
studium de » studium der, studium die, studium den

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 de) OR (studium des)) filosofia de literatur*".