Perhaps you should try some spelling variations:
des litteratures » de litterature, et litterature, la litterature
del litterature » de litterature, et litterature, en litterature
duale studium » duales studium, dualen studium, das studium
text duale » kontext duale
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: "text duale studium la filosofia ((del litterature) OR (des litteratures))*".