Perhaps you should try some spelling variations:
fuel literature » level literature, model literature, novel literature
abel literature » al literature, travel literature, tamil literature
3 filosofia » e filosofia, a filosofia, y filosofia
studium 3 » studium _, studium 1, studium 8
test das » test des, test day, west das

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 das studium 3 filosofia ((fuel literature) OR (abel literature))".
• Adding a wildcard symbol may retrieve word variants: test das studium 3 filosofia ((fuel literature) OR (abel literature))*.