Perhaps you should try some spelling variations:
der filosofia » de filosofia, e filosofia, di filosofia
de literatura » de litterature, la literatura, y literatura
tests stable » tests table, sets stable, test table
filosofia de » filosofia del
tests scale » sets scale, tests safe, tests shall

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests scale) OR (tests stable)) studium der filosofia de literatura*".