Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
filosofica de » filosoficas de, filosofia de, filosofica da
texts das » text das, texts data, texten das
studium e » studium 3, studium 8, studium 5
studium 1 » studium 3, studium 8, studium im

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: texts das ((((studium e) OR (studium 1))) OR (studium _)) filosofica de litterature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "texts das ((((studium e) OR (studium 1))) or (studium _)) filosofica de litterature".
• Adding a wildcard symbol may retrieve word variants: texts das ((((studium e) OR (studium 1))) or (studium _)) filosofica de litterature*.