Looking for Thomas Edward Mortimor Ryan

Hi I am Gale from Sydney and now living in Perth Australia. I have been searching for my ancesters for ove 30 years and there are people i just cant find. Like my great grandparents Denis Ryan and Bridget Elenor Donovan who gave birth to Thomas Edward Mortimor Ryan in 1864 in Warnebool Victoria, so it says on all his cert. But I have not been abled to find hide nor hair of them. If there is anyone out there who can shead a light I would be greatefull forever, Gale