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

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 (de filosofia)) di literatura*".