Perhaps you should try some spelling variations:
le literatura » la literatura, de literatura, de litteratura
da filosofia » la filosofia, di filosofia, a filosofia
e literatura » de literatura, y literatura, e literatur
tests scale » tests stable, sets scale, tests safe
study da » study das, study dca, study d

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 da filosofia ((le literatura) OR (e literatura))".
• Adding a wildcard symbol may retrieve word variants: tests scale study da filosofia ((le literatura) OR (e literatura))*.