Perhaps you should try some spelling variations:
economic rents » economic trends, economic risks, economic reforms
recherche aid » recherche mais, recherche a, recherche au
economic rent » economic report, economic trends, economic agents
ve recherche » de recherche, une recherche, de recherches
studia ve » studie v, studi e, studia 4

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: studia ve recherche aid ((economic aspects) or (((economic rent) OR (economic rents)))) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: studia ve recherche aid ((economic aspects) OR (((economic rent) OR (economic rents)))) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "studia ve recherche aid ((economic aspects) or (((economic rent) OR (economic rents)))) ;".
• Adding a wildcard symbol may retrieve word variants: studia ve recherche aid ((economic aspects) or (((economic rent) OR (economic rents)))) ;*.