Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
di literatura » da literatura, ii literatura, di letteratura
tests scale » tests stable, sets scale, tests safe
study la » study law, study lay, study lca

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 study la filosofia ((di literatura) OR (de literatura))*".