Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
scale student » late student, scale study, scale studies
der filosofia » de filosofia, e filosofia, di filosofia
de literatura » la literatura, y literatura, a literatura
tests scale » tests stable, sets scale, tests safe
student der » studenten der, student under, student debt

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 student der filosofia ((de literatura) OR (de litterature))".
• Adding a wildcard symbol may retrieve word variants: tests scale student der filosofia ((de literatura) OR (de litterature))*.