Perhaps you should try some spelling variations:
studien studie » studien studien, studie studie, studies studies
erste studien » erste studie, erste stufe, erste stunde
filosofia da » filosofia de, filosofia del, filosofia della
filosofia e » filosofia de, filosofia del
studie e » studie 2, studie _, studie 1

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 studien studie e ((filosofia da) OR (filosofia e)) literatura*".