how can i find my great gradnfather Olie Hansey?

hi...my great grandfather, known as olie hansey in the usa married heggie wraa in sthoughton ohio. from reading old pictures and postcards, they had 5 children - carl, john, rackel, mary and my grandmother, delia hansey. he apparnelty left norway from oslo. i would really appreciate it if any one can find his family in norway. thanks in advance.marnie