To locate a town in CZ use http://mapy.atlas.cz
It seems that the village of Odranec is in Moravia's region of CZ and not Bohemia.
The surname BUKACEK shows up in Snezne's phone book which is North of Odranec. http://phone.quick.cz
About 9 phone listings for surname SIR in this Vysocina's region phone book.
Using One Step in locating an Ellis Island manifest www.stevemorse.org
from Odranec a BUKACKOVA (female version of Bukacek) and 5 SIRs.