Perhaps you should try some spelling variations:
der filologica » de filologia, di filologia, e filologia
de literatura » de litterature, la literatura, y literatura
duale studie » duale studien, duale studium, duales studium
e literatura » y literatura, e literatur, a literatura
tests duale » tests due, tests scale, tests damage
studie der » 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 duale studie der filologica ((e literatura) OR (de literatura))".
• Adding a wildcard symbol may retrieve word variants: tests duale studie der filologica ((e literatura) OR (de literatura))*.