Perhaps you should try some spelling variations:
fuel literature » abel literature, level literature, model literature
del literature » model literature, abel literature, al literature
studium das » studium des, studium der, studium als
studium die » studium der, studium des
west das » westen das, west ak, west a

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: west das ((studium das) OR (studium die)) filosofia ((del literature) OR (fuel literature)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "west das ((studium das) OR (studium die)) filosofia ((del literature) or (fuel literature))".
• Adding a wildcard symbol may retrieve word variants: west das ((studium das) OR (studium die)) filosofia ((del literature) or (fuel literature))*.