Perhaps you should try some spelling variations:
le litterature » la litterature, de litterature, le letterature
duale studies » duale studien, scale studies, duale studium
dn filosofia » de filosofia, da filosofia, una filosofia
di filosofia » la filosofia, e filosofia
test duale » test double, test delle, test orale

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 ((dn filosofia) OR (di filosofia)) le litterature*".