Perhaps you should try some spelling variations:
glasses studied » glass studies, clusters studied
cases studied » cases studies, case studies, cases study
la literatura » la litterature, a literature
de filosofia » e filosofia, di filosofia, la filosofia
filosofia la » filosofia da, filosofia le, filosofica da
case studie » case studies, cases studies, case study

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

• If you are trying to use Boolean operators, they must be ALL CAPS: sets ((case studie) OR (((cases studied) OR (glasses studied)))) de filosofia la literatura*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "sets ((case studie) or (((cases studied) OR (glasses studied)))) de filosofia la literatura*".