I can not find either one of my parents birth or death on lds. Why? where do i need to look?

Forrest Smith b 9-18-1912 Eddy Okla d-7-15-1946 Tonkawa Okla. Married Perry Okla 6-13-1931 to Georgia Swafford b 9-3-1913 in Anthony Harper Co. Ks d- 9-29-1965. Want their birth,marriage and death records. Thanks. Their Daughter. Judy