Perhaps you should try some spelling variations:
duale studien » duale studium, scale studien, duales studium
ein filosofia » e filosofia, di filosofia, em filosofia
de literatura » de litterature, la literatura, y literatura
en filosofie » e filosofia, una filosofia, la filosofia
testo » test, tests, texto

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: "testo duale studien ((ein filosofia) OR (en filosofie)) de literatura*".