Perhaps you should try some spelling variations:
dualen studium » duales studium, duale studium
de literatura » de litterature, y literatura, a literatura
la literatura » la litterature, a literature
test dualen » des dualen, test doubles
e filosofia » la filosofia
studium e » studium _, studium 1, studium 3

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 dualen studium e filosofia ((de literatura) OR (la literatura))*".