Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
test duales » test doubles, test rules, test oracles
studium des » studium der
filosofia e » filosofia de, filosofia del
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 e literatura*".