Perhaps you should try some spelling variations:
en litterature » et litterature, une litterature, la litterature
das filosofia » da filosofia, la filosofia, di filosofia
case studium » case studies, das studium, case studie
filosofia en » filosofia e, filosofia del, filosofia con
studium das » studium des, studium der, studium die
texts case » texts cases, text case, texts based