Perhaps you should try some spelling variations:
modell studien » model studies, models studies, moderne studien
delle studien » duale studien, delphi studien, welche studien
le literatura » la literatura, de literatura, e literatura
filosofia le » filosofia de, filosofia e, filosofia del
e filosofia » la filosofia

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: "tesi ((delle studien) OR (modell studien)) e filosofia le literatura".
• Adding a wildcard symbol may retrieve word variants: tesi ((delle studien) OR (modell studien)) e filosofia le literatura*.