My family comes from Gajary and Jakubov. Gajary is much easier to research because the parish records are available to browse on Family Search, however, they cut off in 1895. Jakubov has been at least partially indexed and will appear in a search by name but the records have not yet been made available for browsing. What I would suggest is to look for relatives in ship manifests. Often these records list the closest relative's name/address in the home country and/or the person in the US who will be receiving them and their relationship. The name of an older relative can be incredibly useful in pinpointing them in church records.