Perhaps you should try some spelling variations:
economics agents » economic agents, economic agent, economics agency
economics agent » economic agent, economics agency, economic agents
recherche land » recherche dans, recherche und, recherche prend
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.

• Performing a fuzzy search may retrieve terms with similar spellings: studi e recherche land ((economics agent) OR (economics agents)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "studi e recherche land ((economics agent) OR (economics agents)) ;*".