Gwenda You need to find a precise place of birth among some of the ancestors US documents. There is no way around it. Was your grandmother naturalized citizen? Did she marry in USA? Have you thought about contacting the church she had her children baptised?
Please take a look in www.ellisislandrecords.org Tobola, AnnaVysenovice, Bohemia1119001911 Tobola, AnnaHELD INQUIRY019111911 Tobola, MatusSt. Mesto. Moravia1918941913 Possible that the above locations could provide a clue to your ancestors.