Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
scale studies » case studies, scale study
de literatura » la literatura, y literatura, a literatura
li filosofia » la filosofia, di filosofia, e filosofia
test scale » tests scale, best scale, rest scale
studies li » studies lia, studies lit, studies l2

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 li filosofia ((de literatura) OR (de litterature))*".