Perhaps you should try some spelling variations:
duale studenten » die studenten, durch studenten, alte studenten
der filosofia » de filosofia, di filosofia, da filosofia
la literatura » la litterature, a literature
e filosofia » la 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 studenten ((der filosofia) OR (e filosofia)) la literatura*".