Perhaps you should try some spelling variations:
es filosofica » e filosofica, e filosofia, em filosofia
filosofica la » filosofica da, filosofia la, filosofia da
la literatura » la litterature, a literature
case studien » case studies, case studieson, cases studies
case studie » case studies, cases studies, cases studied

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: "sets ((case studien) OR (case studie)) es filosofica la literatura*".