Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
lit filosofia » la filosofia, di filosofia, alla filosofia
case studies » case study
studies lit » studies list, studies li, studies lia

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 OR text) case studies lit filosofia del litterature".
• Adding a wildcard symbol may retrieve word variants: (test OR text) case studies lit filosofia del litterature*.