Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
de filosofia » di filosofia, la filosofia, a filosofia
tests scale » tests stable, sets scale, tests safe
e filosofia » la filosofia
test scale » best scale, rest scale, treat 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: ((test scale) OR (tests scale)) studies ((de filosofia) OR (e filosofia)) da literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((test scale) or (tests scale)) studies ((de filosofia) OR (e filosofia)) da literatura".
• Adding a wildcard symbol may retrieve word variants: ((test scale) or (tests scale)) studies ((de filosofia) OR (e filosofia)) da literatura*.