Perhaps you should try some spelling variations:
fuel literature » abel literature, level literature, model literature
del literature » model literature, abel literature, al literature
di filosofia » la filosofia, e filosofia
ii studium » vii studium, im studium, ins studium
studium di » studium die, studium i, studium ii
test ii » test i

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 ii studium di filosofia ((del literature) OR (fuel literature))".
• Adding a wildcard symbol may retrieve word variants: test ii studium di filosofia ((del literature) OR (fuel literature))*.