Perhaps you should try some spelling variations:
la litterature » a literature
duales studium » das studium
duale studie » duale studien, duale studium, dualen studium
filosofia la » filosofia da, filosofia le, filosofica da
y filosofia » e filosofia, a 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: "tests ((duale studie) OR (duales studium)) y filosofia la litterature".
• Adding a wildcard symbol may retrieve word variants: tests ((duale studie) OR (duales studium)) y filosofia la litterature*.