Unsearchable lessons

A few times I've gone looking for a lesson via the search box, and been unable to locate it without resorting to Google. A current example is the Intermediate lesson "Job Interview" - searching for the term doesn't yield any results. The lesson didn't seem to show up in my own lesson list, either. Is there any reason I should be able find a lesson with a straight-forward title search? Searching for vocab words doesn't seem to make a difference, either - the lesson stays invisible.