Perhaps you should try some spelling variations:
della literatura » della letteratura, nella letteratura, la literatura
pela literatura » pena literatura, la literatura, a literatura
acute studien » acute studies, ante studien, aue studien
dd filosofia » di filosofia, de filosofia, da filosofia
tests acute » testis acute, testing acute, versus acute
studien dd » studies dd, studien der, studien die

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 acute studien dd filosofia ((della literatura) OR (pela literatura))".
• Adding a wildcard symbol may retrieve word variants: tests acute studien dd filosofia ((della literatura) OR (pela literatura))*.