Perhaps you should try some spelling variations:
filosofia model » filosofia del, filosofia moderna, filosofia morale
model literatur » modell literatur, model literature, moden literatur
stents safety » agents safety, events safety, tenth safety
safety studie » safety studies, safety study, safety stories
de filosofia » e filosofia, di filosofia, la filosofia
studie de » studie der, studie die, studie des