2h point spread line. need help

I've been back tracking basketball game the last years and this year. So far the system is hitting at a very high rates for  2h half point spread for over and under. I want to back track NFL but i couldn't find or locate any site that has it. Can anyone helped me out please. I  need to locate 2h nfl for last two  years, and back track them. i need 2h point spread