Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, e literatura
da literatura » la literatura, a literatura, de literatura
test scale » tests scale, best scale, treat scale
rest scale » best scale, rust scale, great scale
studies la » studies lab, studies lca, studies lia

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 (rest scale)) studies la filosofia ((del literatura) OR (da literatura))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((test scale) or (rest scale)) studies la filosofia ((del literatura) OR (da literatura))*".