Perhaps you should try some spelling variations:
economic rationale » economics regional, economies national
economic aziendale » economico aziendale, economia aziendale, economic agenda
recherche main » recherche mais, recherche en, recherche a
e recherche » de recherche, en recherche, et recherche
studi e » studi per, studia ve, studie 2

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: "studi e recherche main ((economic aziendale) OR (economic rationale)) ;~".
• Adding a wildcard symbol may retrieve word variants: studi e recherche main ((economic aziendale) OR (economic rationale)) ;*.