Perhaps you should try some spelling variations:
del literatura » pela literatura, da literatura, e literatura
scale studies » case studies, scale study
de literatura » de litterature, la literatura, y literatura
de filosofia » e filosofia, di filosofia, la filosofia
test scale » tests scale, best scale, rest scale
studies de » studies der, studies die, studies doe

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: "test scale studies de filosofia ((del literatura) OR (de literatura))".
• Adding a wildcard symbol may retrieve word variants: test scale studies de filosofia ((del literatura) OR (de literatura))*.