The "great economical advances" of Nazi Germany were just Nazi propaganda.
If you think Nazis had anything to do with Socialism, I suggest you read up on what the Nazis did to the Socialists in Germany ...
They send the competition to the camps, but at the same time for example made it really tough to evict people from flats for landlords.
Nationalistic socialism was a socialism too.
They even had the enormous debts and mismanagment (Mefo-Wechsel), that in addition with racism and a non-fertilizer agriculture made the "Expansion" in all directions necessary to avoid collapse.