Perhaps you should try some spelling variations:
duale studie » duale studien, duale studium, duales studium
filosofia la » filosofia le, filosofica da, filosofia das
filosofia da » filosofia de, filosofia del, filosofia e
tests duale » tests due, tests scale, tests damage
studie y » studie 2, studie _, studie 1

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 y ((filosofia la) OR (filosofia da)) litterature".
• Adding a wildcard symbol may retrieve word variants: tests duale studie y ((filosofia la) OR (filosofia da)) litterature*.