So the problem was that I had an error in the Crawl Log "The parameter is incorrect. (Could not find appropriate places on the root TypeDescriptor to read sub-identifier values for the Instance of Entity" and with the line <TypeDescriptor TypeName="System.String" IdentifierName="Identifier" Name="Nume" /> instead of <TypeDescriptor TypeName="System.String" />it did the trick.
Hi Steve, On any new managed property that I want to create the number of items found with this property = 0 and when I search it returns nothing. I dont know were could be the problem.