Ask HN: How to find software developer positions that offer relocation?

I live in Tokyo as permanent resident now and looking for opportunities to work in overseas. I have Germany, U.S., or Australia in my mind for place to relocate, but could be other countries depending on jobs.

I looked at Stack Overflow Careers and Github Jobs but couldn't find many positions that offer relocation.

Could anyone give me advices for better way to look for such positions?