Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
di filosofia » la filosofia, e filosofia
filosofia la » filosofia da, filosofia le, filosofica da
tests scale » tests stable, sets scale, tests safe
sets stable » sets table, setup stable, tests stable
studien di » studien die, studien dd, 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: ((tests scale) OR (sets stable)) studien di filosofia la literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests scale) or (sets stable)) studien di filosofia la literatura*.