Perhaps you should try some spelling variations:
economic agent » economic agents, economic rent, economic rents
recherche und » recherche en, recherche d'une, recherche prend
und economic » under economic, sound economic, und economies
studi per » studie der
studia ve » studie v, studia 4, studia a
studi e » studie 2, studi di, studie _

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) or (studia ve))) or (studi per)) recherche und economic agent ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((studi e) OR (studia ve))) OR (studi per)) recherche und economic agent ;.
• Adding a wildcard symbol may retrieve word variants: ((((studi e) or (studia ve))) or (studi per)) recherche und economic agent ;*.