Koprivets is small - 884 souls. Try a search for Byala and you might have more luck
That is Byala in Russe province, not thje one near Varna. (Byala, Rusensko)
Have you tried the train service that comes from Ruse vis Gorna Oryahovirsa to Veliko Turnovo and Stara Zagora ? A lifeline in wintry weather.
Worth the trip to Russe just to see the magnificent Station, which is a reminder of that city's heyday, many years ago.
Trains also from here to Sofia - but do not take the slow train !