Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
de filosofia » e filosofia, di filosofia, la filosofia
filosofia la » filosofia da, filosofia le, filosofica da
tests scale » tests stable, tests safe, tests shall
sets scale » sets scaled, sets scales, set scale
studies de » studies der, studies die, studies doe

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 scale)) studies de filosofia la literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests scale) or (sets scale)) studies de filosofia la literatura*.