Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
die filosofia » di filosofia, e filosofia, da filosofia
tests stable » tests table, sets stable, test table
stable state » stable states, unstable states, stable sets
de filosofia » e filosofia, di filosofia, la filosofia

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 stable state ((die filosofia) OR (de filosofia)) da literatura".
• Adding a wildcard symbol may retrieve word variants: tests stable state ((die filosofia) OR (de filosofia)) da literatura*.