Perhaps you should try some spelling variations:
das filosofia » da filosofia, la filosofia, di filosofia
e literatura » de literatura, y literatura, e literatur
belt stable » belt scale, tilt stable
salt stable » fast stable, salt state
studien das » studie das, studien des, studien der
filosofia e » filosofia de, filosofia del

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: ((belt stable) OR (salt stable)) studien das filosofia e literatura.
• Adding a wildcard symbol may retrieve word variants: ((belt stable) or (salt stable)) studien das filosofia e literatura*.