Perhaps you should try some spelling variations:
le literatura » de literatura, e literatura, de litteratura
la literatura » la litterature, a literature
da filosofia » la filosofia, di filosofia, a filosofia
tests scale » tests stable, sets scale, tests safe
test scale » best scale, rest scale, treat scale
study da » study das, study dca, study d

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: ((test scale) OR (tests scale)) study da filosofia ((le literatura) OR (la literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((test scale) or (tests scale)) study da filosofia ((le literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: ((test scale) or (tests scale)) study da filosofia ((le literatura) OR (la literatura))*.