X films no longer able to be found on search?

For some reason a lot of UK sitcoms of the 1980s were obsessed with dropping in references to famous adult films, particularly a very famous one with the name "Debbie" and a location in Texas in the title.

Whenever I've had to add this to Movie Connections, I have to go via the direct link on Wikipedia, it won't give me a result by using the IMDb's search results?