Perhaps you should try some spelling variations:
en literatura » e literatura, pena literatura, en litterature
quae durante » quito durante, e durante, quae deerant
5 filosofia » a filosofia, y filosofia, _ filosofia
e filosofia » la filosofia
quae purae » quae cura

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: ((quae durante) OR (quae purae)) studien ((5 filosofia) OR (e filosofia)) en literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((quae durante) or (quae purae)) studien ((5 filosofia) OR (e filosofia)) en literatura".
• Adding a wildcard symbol may retrieve word variants: ((quae durante) or (quae purae)) studien ((5 filosofia) OR (e filosofia)) en literatura*.