Just a suggestion. Maybe post message under surname, or if they immigrated where they did so.
Some folks say don't post same message on several forums, I disagree, the more messages on various forums you post a message the more people will most likely see them, and who knows, may have answers for you(and others).
I've found folks that were born in Russia, and besides surname thats all I knew when I started. Now I've learned quite a bit about them, way more than I expected to.
They were the family of a friend of mine, and shes thrilled.
She didn't even know a lot of the folks existed.
So keep options open and don't give up.
What is/are the surname/s your searching for?
Good Luck
Barbara