IMDB over TVDB

Hey

I have found the tv show i am looking for on IMDB " Great Blunders of WWII " when i go to TV show Selector its says its not there because its not present on TVDB. I though adding the IMDb code into the search box would find it but it does not work. I tried seraching the forums and i could not see anything although im sure this is a common problem anyhelp would be great.