You can see how Prucha families moved over time by selecting different Census years.
The information for this chart came from the U.S. Immigration Collection at Ancestry. You can find out where the majority of the Prucha families were living before they immigrated to the U.S and learn where to focus your search for foreign records.
from the New York Passenger Lists
You can find out when most of the Prucha families immigrated to the United States. You can focus your search to emigration records dating from that era.
from 1881 UK Census Data
Census records can offer a lot of little known facts about your Prucha ancestors, such as occupation.
Occupation can tell you about your ancestors' social status and economic status.