Perhaps you should try some spelling variations:
tests stable » tests table, sets stable, test table
e filosofica » e filosofia, e filosofiche, a filosofia
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura
sets scale » sets scaled, sets scales, set scale

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: ((sets scale) OR (tests stable)) studies e filosofica a literatura.
• Adding a wildcard symbol may retrieve word variants: ((sets scale) or (tests stable)) studies e filosofica a literatura*.