The non-profit organisation ISEP offers Masaryk University students the chance to spend up to an academic year at more than 150 universities in the USA and at dozens of universities in another 50 states around the world. You can find more information about study placements through ISEP here.
You can follow study placements in the United States with work placements of the same length (Academic Training), thanks to which you will be able to legally work in the USA in the field of your studies (more here). You can organise this further placement once you are already on your placement in the USA. In other countries it is not possible to have this further placement.