Perhaps you should try some spelling variations:
double studium » duale studium
da literatura » a literatura, de literatura, na literatura
la literatura » la litterature, a literature
test double » test doubles
studium la » studium a, studium als, studium das

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 double studium la filosofia ((da literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: test double studium la filosofia ((da literatura) OR (la literatura))*.