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