Perhaps you should try some spelling variations:
fuel literature » abel literature, level literature, model literature
del literature » model literature, abel literature, al literature
scale studium » schule studium, scale studies, duale studium
des filosofia » de filosofia, e filosofia, di filosofia
tests scale » tests stable, sets scale, tests safe
studium des » studium der

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: "tests scale studium des filosofia ((del literature) OR (fuel literature))".
• Adding a wildcard symbol may retrieve word variants: tests scale studium des filosofia ((del literature) OR (fuel literature))*.