People who use AltaVista or Dejanews to read a particular newsgroup have been complaining that all they get is NoCeM notices. It is a fundamental part of the NoCeM algorithm for the notice contain a list of the newsgroups that were spammed -- this list is what the search is finding. Understandably it's as annoying as spam to users who read news this way.
Here are a few workarounds to help resolve the problem -- if these don't work for you, or you have another suggestion, please email me at firstname.lastname@example.org.
Assuming you are looking for articles in alt.books.technical:
newsgroups:alt.books.technical). (Click for a demonstration.)
alt.books.technical and not @@BEGIN NCM BODY" will hide all NoCeM notices that follow the published standard.