Perhaps you should try some spelling variations:
life literature » polite literature
duale studien » duale studium, scale studien, duales studium
der filosofia » de filosofia, e filosofia, di filosofia
studien der » studie der, studenten der
test duale » test double, test delle, test orale
prose » prove

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: test duale studien der filosofia ((life literature) OR (prose literature))*.