Can't get all search results

I can't get all May 2006 search results to show up on:

    http://archives.postgresql.org/

If I search for "semaphore", I see only one entry for May 2006, while
this shows three emails with that title from the patches list for May
7-8, 2006:

    http://archives.postgresql.org/pgsql-patches/2006-05/index.php

--
  Bruce Momjian   http://candle.pha.pa.us
  EnterpriseDB    http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +