Train: By train you can easily travel to Liberec from several Czech cities.
Bus: Connections with Europe from Liberec are available, for example, through the bus line or Eurolines Student Agency. In many cases it is the cheapest way to travel long distances but is not advisable, since the trip takes time and also is tiring.
Car: The transport car can be useful especially when you have to scroll through more cities and go with lots of luggage. With no problem you can reach Liberec and then travel throughout the Czech Republic by car as there are highways practically from all over Europe.