Perhaps you should try some spelling variations:
abel literature » al literature, fuel literature, travel literature
del literature » model literature, fuel literature, al literature
delle studien » duale studien, delphi studien, modell studien
a filosofia » la filosofia, e filosofia, di filosofia
test delle » testi delle, tesi delle, test della
studien a » studien am, studien _, studien 3

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: "test delle studien a filosofia ((del literature) OR (abel literature))*".