Perhaps you should try some spelling variations:
y filosofico » y filosoficos, y filosofia, e filosofiche
e filosofica » e filosofia, e filosofiche, a filosofia
a literatura » la literatura, a literature, y literatura
du studie » zu studie, eu studies, zu studien
test du » test de, test d, test do

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 du studie ((y filosofico) OR (e filosofica)) a literatura".
• Adding a wildcard symbol may retrieve word variants: test du studie ((y filosofico) OR (e filosofica)) a literatura*.