Perhaps you should try some spelling variations:
die filosofia » di filosofia, de filosofia, e filosofia
del literatur » model literatur, teil literatur, igel literatur
agent social » agents social, age social, against social
best social » west social, east social, ist 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: ((agent social) OR (best social)) studies die filosofia del literatur.
• Adding a wildcard symbol may retrieve word variants: ((agent social) or (best social)) studies die filosofia del literatur*.