Perhaps you should try some spelling variations:
die filosofica » di filosofia, de filosofia, e filosofica
duales studium » das studium
filosofica la » filosofica da, filosofia la, filosofia da
la literatura » la litterature, a literature
duale studie » duale studien, duale studium, dualen studium

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: "best ((duale studie) OR (duales studium)) die filosofica la literatura*".