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

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