Perhaps you should try some spelling variations:
delle studies » delhi studies, creole studies, della studiosa
delay studies » decay studies, malay studies, play studies
ds filosofica » di filosofia, de filosofia, da filosofia
de literatura » de litterature, y literatura, a literatura
la literatura » la litterature, a literature

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tesi ((delle studies) OR (delay studies)) ds filosofica ((de literatura) OR (la literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tesi ((delle studies) OR (delay studies)) ds filosofica ((de literatura) or (la literatura))".
• Adding a wildcard symbol may retrieve word variants: tesi ((delle studies) OR (delay studies)) ds filosofica ((de literatura) or (la literatura))*.