Perhaps you should try some spelling variations:
pela literatura » pena literatura, la literatura, a literatura
del literatura » de literatura, da literatura, e literatura
test scale » tests scale, best scale, rest scale
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: "test scale study la filosofia ((del literatura) OR (pela literatura))".
• Adding a wildcard symbol may retrieve word variants: test scale study la filosofia ((del literatura) OR (pela literatura))*.