RootsWeb lists only three Hvozdovich surnames, one married to a Joseph P. Hanulya from Alsórépás, Szepes-Vármegye, Osztrák-Magyar Monarchia:
http://worldconnect.rootsweb.ancestry.com/cgi-bin/igm.cgi?surname=Hvozdovich&given=
The Hvozdovich surname there came from Osztrak, Hungary, but you might find more from other places.
Family Search lists more of the Hvozdovich surname, but I don't know if they give the information about where the name came from:
https://familysearch.org/search/record/results?count=20&query=%2Bsurname%3AHvozdovich
A Maria Hvoszovich emigrated to the US in 1920 from Kurimka, Slovakia:
http://www.libertyellisfoundation.org/passenger-result