Perhaps you should try some spelling variations:
die filosofica » di filosofia, e filosofica, vida filosofica
de filosofia » e filosofia, di filosofia, la filosofia
a literatura » la literatura, a literature, y literatura
tests scale » tests stable, sets scale, tests safe
test table » test tables, tests table, test tabelle

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 (test table)) studies ((die filosofica) OR (de filosofia)) a literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests scale) or (test table)) studies ((die filosofica) OR (de filosofia)) a literatura".
• Adding a wildcard symbol may retrieve word variants: ((tests scale) or (test table)) studies ((die filosofica) OR (de filosofia)) a literatura*.