At 02:51 09/28/2002 Saturday, Gilles Frydman wrote:
 >Talking of hyphen, I have received a couple requests for clarification about
 >the archive searches returning no matches when the search is done on a
 >hyphenated term like COX-2 or 9-NC.
 >How should the search be formatted to retrieve exactly terms like these?

It may be a reserved syntactic token.  Thus, try:

'COX-2' or '9-NC'