I have just started researching the Prachar family in Saline NE for a friend. Hopefully, this is still an active topic now.
Karel/Karl/Charles Prachar and family arrived in the US in 1874. I have been able to determine that Karel Prachar was from Sopotnice, Litomysle, Chrudim.
"Nebraska, Kansas Czech Settlers, 1891-1895," a book by Margie Sobotka lists the residents for each county by name and village of birth. The book is online at the Czech Heritage Project on the UNL website -
http://www.unl.edu/czechheritage/Margie_sobotka.shtml.
I found Vaclac Bitner listed in Lancaster CO NE but no village was listed. Ant J Bitner was in Colfax CO with a village Milovec, Domazlice, Plzen. Jos Bittner in Sheridan CO says "Do not know" for village.
I don't know what other names you looked at but the Prachjl family in Saline are from Vosecek, Podebrady, Caslav.
The Czech Heritage Site is worth taking a look at for further information.