Perhaps you should try some spelling variations:
during studied » during studies, burning studied, docking studied
der filosofica » de filosofia, e filosofica, e filosofia
tests during » costs during, protests during, testing during
a literatura » la literatura, a literature, a literatur
y literatura » la literatura
studied der » studie der, studien der, studies 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 during studied der filosofica ((a literatura) OR (y literatura))".
• Adding a wildcard symbol may retrieve word variants: tests during studied der filosofica ((a literatura) OR (y literatura))*.