Perhaps you should try some spelling variations:
duales studium » das studium
de litterature » la litterature, et litterature
test duales » test doubles, test rules, test oracles
i filosofia » di filosofia, e filosofia, y filosofia
a filosofia » la filosofia, e filosofia, di filosofia

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 ((i filosofia) OR (a filosofia)) de litterature".
• Adding a wildcard symbol may retrieve word variants: test duales studium ((i filosofia) OR (a filosofia)) de litterature*.