how to find the history of my car

If the previous owners name is on the title, start there. Ask them what they know about the car. Where it came from? How long they owned it? Any stories on the car when they owned it? Do they have any pics of the car from when they owned it?

If you know the city where the car spent some time post an ad asking if anyone remembers the car.

Also you can go to the dept of motor vehicles and see if there is any way your state could run a title history search on the car. You will likely need all the paperwork in your name at the time you do that.