We have it from Voldemort that the Ministry of Magic sent teams of Aurors abroad to look for him after his demise at Godric's Hollow.
"I could possess the bodies of others. But I dared not go where other humans were plentiful, for I knew that the Aurors were still abroad and searching for me."
(Goblet of Fire, Chapter 33, The Death Eaters).
My question is simply what would they have done with him if they had found him?
They are Aurors. Ghostbusters they are not. The Aurors could hardly do much to Voldemort when he didn't have a body. As I've said on another question, spirit-Voldemort could simply swoosh away when they confront him. What kind of threat do they pose to him that would make him hide from them? And if they knew they couldn't harm him, what explains the decision to send in the Auror hit-squads?