Perhaps you should try some spelling variations:
fuel literature » abel literature, level literature, model literature
filosofia fuel » filosofia del, filosofia de, filosofia e
a filosofia » la filosofia, e filosofia, di filosofia
studium a » studium am, studium ad, studium _
test dem » test des, test de, nebst dem

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