Perhaps you should try some spelling variations:
del literature » model literature, abel literature, fuel literature
e filosofia » la filosofia
studium e » studium _, studium 1, studium 3
test i » test ii
test 1 » test 2, test 3

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: "((test i) OR (test 1)) studium e filosofia del literature".
• Adding a wildcard symbol may retrieve word variants: ((test i) OR (test 1)) studium e filosofia del literature*.