Perhaps you should try some spelling variations:
orale studien » duale studien, scale studien, globale studien
frage studien » lage studien, frage stellen, erste studien
da filosofia » la filosofia, di filosofia, a filosofia
e literature » e literatur, life literature, prose literature
filosofia e » filosofia de, filosofia del

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: test ((orale studien) OR (frage studien)) da filosofia e literature.
• Adding a wildcard symbol may retrieve word variants: test ((orale studien) or (frage studien)) da filosofia e literature*.