Perhaps you should try some spelling variations:
economics agency » economic agency, economic agents, economic agent
recherche land » recherche prend, recherches dans, recherche les
recherche dans » recherches dans, recherche des, recherche mais
recherche und » recherche en, recherche d'une, recherche prend
studi e » studi per, studia ve, studie 2

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 ((((recherche land) OR (recherche dans))) OR (recherche und)) economics agency ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "studi e ((((recherche land) OR (recherche dans))) or (recherche und)) economics agency ;~".
• Adding a wildcard symbol may retrieve word variants: studi e ((((recherche land) OR (recherche dans))) or (recherche und)) economics agency ;*.