Perhaps you should try some spelling variations:
duale studien » duale studium, duales studium, dualen studium
scale studien » scale studies, scale student, soziale studien
a literatura » la literatura, a literature, y literatura
filosofia a » filosofia da, filosofia la, filosofia e

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: "texto ((duale studien) OR (scale studien)) _ filosofia a literatura".
• Adding a wildcard symbol may retrieve word variants: texto ((duale studien) OR (scale studien)) _ filosofia a literatura*.