Perhaps you should try some spelling variations:
la literature » la litterature, a literature, la literatura
tests stable » tests table, sets stable, test table
filosofia la » filosofia da, filosofia le, filosofica da
tests scale » sets scale, tests safe, tests shall
studium la » studium a, studium als, studium das

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 la filosofia la literature".
• Adding a wildcard symbol may retrieve word variants: ((tests scale) OR (tests stable)) studium la filosofia la literature*.