请教布达佩斯到布拉格的夜火车该怎么买啊？

我上了匈牙利铁路的官网，两个站点的地址也写的很具体，但是还是跳出来“No offer available for the journey with these conditions. For the list of available offers click here.
In case you have entered a city marked with asterisk as departure or destination (e.g.: BUDAPEST*, WIEN*, PRAHA*, HAMBURG*, WARSZAWA*, etc.), and you have not received any offer, please repeat the search with entering a specific station of that city (e.g.: Budapest-Keleti, Wien Hauptbahnhof, Praha hl. n., Hamburg Hbf., Warszawa Centralna, etc.)”