Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
della studien » cella studie, delphi studien, modell studien
am filosofia » a filosofia, la filosofia, e filosofia
em filosofia » e filosofia, la filosofia, di filosofia
test della » testa della, testi della, test delle

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 della studien ((am filosofia) OR (em filosofia)) la literatura".
• Adding a wildcard symbol may retrieve word variants: test della studien ((am filosofia) OR (em filosofia)) la literatura*.