Perhaps you should try some spelling variations:
based studien » based studies, basedow studien, band studien
based student » based study, based studies
da literatura » la literatura, a literatura, de literatura
filosofia da » filosofia de, filosofia del, filosofia e
e filosofia » la filosofia

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 ((based studien) OR (based student)) e filosofia da literatura.
• Adding a wildcard symbol may retrieve word variants: sets ((based studien) or (based student)) e filosofia da literatura*.