Sandra
I am afraid that you will need to hire a researcher or go to the archive yourself. Not sure if the archive still does the research. They did few years back.
Some researchers in this site:
www.centroconsult.sk Of course you can find more if you
www.google.com www.genea.cz/ruzne/svet.htm#13.Dwww.iarelative.comwww.cgsi.orgwww.csagsi.orgwww.ncsml.org