Perhaps you should try some spelling variations:
orale studien » duale studien, frage studien, globale studien
scale studien » scale studies, scale student, duale studien
le literatura » la literatura, de literatura, e literatura
ds filosofia » di filosofia, de filosofia, la filosofia
da filosofia » la filosofia, di filosofia, a filosofia

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 (scale studien)) ((ds filosofia) OR (da filosofia)) le literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((orale studien) OR (scale studien)) ((ds filosofia) or (da filosofia)) le literatura".
• Adding a wildcard symbol may retrieve word variants: test ((orale studien) OR (scale studien)) ((ds filosofia) or (da filosofia)) le literatura*.