Perhaps you should try some spelling variations:
duale studium » duales studium, dualen studium, das studium
dna literatur » dsa literatur, sna literature, a literatur
da literatur » da literatura, dsa literatur, a literatur
test duale » test double, test delle, test orale
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 duale studium la filosofia ((da literatur) OR (dna literatur))*".