Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
scale studies » case studies, scale study
der filosofia » de filosofia, e filosofia, di filosofia
studies der » studies ds, studies d, studies dn
test scale » tests scale, best scale, rest scale

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: test scale studies der filosofia del literatura*.