Perhaps you should try some spelling variations:
economic aziendale » economico aziendale, economia aziendale, economic agenda
economic rationale » economics regional, economies national
recherche basis » recherche mais, rechtliche basis, recherche dans
studie 2 » studie om
studi e » studi per, studia ve, studi di

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: ((studi e) OR (studie 2)) recherche basis ((economic aziendale) OR (economic rationale)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((studi e) OR (studie 2)) recherche basis ((economic aziendale) or (economic rationale)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((studi e) OR (studie 2)) recherche basis ((economic aziendale) or (economic rationale)) ;*.