Perhaps you should try some spelling variations:
duale studien » scale studien, duales studium, dualen studium
duale studium » duales studium, dualen studium, das studium
da literature » a literature, da literatura, la literature
filosofia da » filosofia de, filosofia del, filosofia e
e filosofia » la 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 ((duale studien) OR (duale studium)) e filosofia da literature*".