Perhaps you should try some spelling variations:
stufe studien » studie studien, stufen studie, studien studien
da literatura » la literatura, a literatura, de literatura
erste stufe » erster stufe
3 filosofia » e filosofia, y filosofia, _ filosofia
a filosofia » la filosofia, e filosofia, di 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: "erste stufe studien ((3 filosofia) OR (a filosofia)) da literatura".
• Adding a wildcard symbol may retrieve word variants: erste stufe studien ((3 filosofia) OR (a filosofia)) da literatura*.