Perhaps you should try some spelling variations:
life literature » polite literature, prose literature
filosofia life » filosofia le, filosofia de, filosofia e
orale studien » duale studien, frage studien, scale studien
de filosofia » e filosofia, di filosofia, la filosofia
test orale » test oracle, test oral, test oracles
studien de » studien der, studien die, studien des