Don't worry! Since you know what towns they came from than you already know more than many of us researchers knew when we began our searches.
Cernicvic may be today called:
Chernivtsi [Ukr], Chernevtsy [Rus], Kleyn-Tshernevits [Yid], Czerniejowce [Pol], Chernivitz, Cernivci, Cernevţi, Chernevtsi, Tschernewzi, Çernivtsi
Skora may be:
Skvira [Rus, Yid], Skvyra [Ukr], Skwira [Pol], Square, Skver, Skvere
Ozno may be:
Ośno Lubuskie [Pol], Drossen [Ger], Drossen Stadt, Ośno
These are the closest soundex matches found at:
You can search yourself for the towns at the above site. You may find something that makes more sense to you.
You can search for records from these towns in the appropriate country databases at:
I suggest doing phonetic or soundex searches on names as they get spelled in various ways in the records.
Good luck in your search,