I think you need to be more specific but I did find this if it helps.
http://christianthinktank.com/quirinius.html
We also know that the Roman census would not have required anyone to travel to their ancestral city for a census, since they would be taxed where they lived.
Matthew doesn't even bother with the gymnastics; he just has the family living in Jerusalem in a house.
The point is that it's a story, not history; provably so.