Perhaps you should try some spelling variations:
economico aziendale » economia aziendale
economic rationale » economics regional, economies national
recherche arts » recherche partie, recherche et, recherche les
di recherche » de recherche, de recherches, la recherche
study di » study d, study dc, study do

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

• Performing a fuzzy search may retrieve terms with similar spellings: study di recherche arts ((economic rationale) or (economico aziendale)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: study di recherche arts ((economic rationale) OR (economico aziendale)) ;.
• Adding a wildcard symbol may retrieve word variants: study di recherche arts ((economic rationale) or (economico aziendale)) ;*.