Perhaps you should try some spelling variations:
der filosofia » de filosofia, di filosofia, da filosofia
scale studie » scale studies, scale studien, scale study
y literatura » la literatura
tests scale » tests stable, sets scale, tests safe
e filosofia » la filosofia

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "tests scale studie ((der filosofia) OR (e filosofia)) y literatura*".