African teams with their 5 spots have made more noise than all of the Scandinavian and Slavic countries you mentioned.
Let's look which teams you mentioned made it to the KO stage:
2002 - Sweden (lost to Senegal R16), Denmark (out R16); Senegal (out QFs)
2006 - None (Czech, ranked 2 in world got spanked by Ghana; Sweden, Serbia, Croatia, Ukraine all out); Ghana (out R16)
2010 - Ukraine (out R16); Ghana (out QFs)
2014 - None (Bosnia, Russia, Croatia all fail); Algeria and Nigeria (out R16)
Lots of fail on that list tbh
