Sergio Clerici at Atlanta will find them but he is getting old. Natal at Sao Paulo is very good at it but it is hard to drag him away from whichever club he is at. Gilmar Francisco at Cruzeiro is not quite as good at what you want but is young and very good. You may be able to find some more Brazilian Scouts with very high determination who are actually retired players. The reason why determination is the key attribute is because scouts with high determination find more players increasing you chances of finding a gem.
EDIT: Gilmar Francisco is very cheap.