Perhaps you should try some spelling variations:
stadien studien » studien studien, stadler studien, studien studie
teste stadien » erste studien, tertiare stadien, testende studien
die filosofia » de filosofia, e filosofia, da filosofia
da literatura » la literatura, a literatura, de literatura
di filosofia » la filosofia, e filosofia

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: "teste stadien studien ((die filosofia) OR (di filosofia)) da literatura".
• Adding a wildcard symbol may retrieve word variants: teste stadien studien ((die filosofia) OR (di filosofia)) da literatura*.