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

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