Perhaps you should try some spelling variations:
studien studies » studies studies, studien studie, studien studien
erste studien » erste studie, erste stufe, erste stunde
e literatura » de literatura, y literatura, e literatur
e filosofia » la filosofia
filosofia e » filosofia de, filosofia del

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

• Adding a wildcard symbol may retrieve word variants: erste studien studies e filosofia e literatura*.