Perhaps you should try some spelling variations:
sociali studies » social studies, sociale studies, societal studies
filosofia igel » filosofia de, filosofia e, filosofia en
texto sociali » texto social, text social, texts social
studies die » studie die, studien die, studies does

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: texto sociali studies die ((filosofia igel) OR (filosofia del)) literatur*.