What address should a Canadian citizen apply with for DTV Soft Power while in Vietnam, and what proof is required?

Hi everyone! I am a Canadian citizen who left 9 years ago, my last residency was in Kenya (restricted country for DTV), but now I am back in Southeast Asia :) I want to go to Vietnam to apply for my DTV Soft Power, but I am wondering which 2nd address should I put: my parents' /permanent (back-drop) address in Canada OR my (last residency) address in Kenya ? What type of proof (will they ask for ''bills'') for that 2nd address? Can a bank statement showing your home address (e.g. Kenya bank account slip with address in-country) works as a ''bill'' / proof ? Thanks for your help!!!!