Perhaps you should try some spelling variations:
duale studies » duale studien, scale studies, duale studium
filosofia da » filosofia de, filosofia e, filosofia della
test duale » test double, test delle, test orale
studies de » studies der, studies die, studies doe

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: "test duale studies de ((filosofia da) OR (filosofia del)) litterature*".