Perhaps you should try some spelling variations:
model literature » models literature, model literatur, modern literature
filosofia model » filosofia del, filosofia moderna, filosofia morale
modell studien » model studies, models studies, moderne studien
test modell » tekst modell, test models, test model
a filosofia » la filosofia, e filosofia, di filosofia
studien a » studien am, studien _, studien 3