Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
tests stable » tests table, sets stable, test table
di filosofia » la filosofia, e filosofia
filosofia la » filosofia da, filosofia le, filosofica da
tests scale » sets scale, tests safe, tests shall
studien di » studien die, studien dd, studien der

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