Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
del literatura » de literatura, pela literatura, da literatura
scale studies » scale study
test scale » tests scale, best scale, rest 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 studies la filosofia ((del literatura) OR (de litterature))*.