Perhaps you should try some spelling variations:
hash studenten » hos studenten, des studenten, has student
di literatura » de literatura, da literatura, ii literatura
di filosofia » la filosofia
e filosofia » la filosofia
sets hash » set hash, sets have

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 hash studenten ((di filosofia) OR (e filosofia)) di literatura".
• Adding a wildcard symbol may retrieve word variants: sets hash studenten ((di filosofia) OR (e filosofia)) di literatura*.