zctextindex: everything except 'some words'

Hi,
 
I'm doing a search in the ZCatalog on a ZCTextIndex, and I'm not getting any results on a particular search

The different modes I'm using are 'ET', 'OU', and 'SAUF' (just in my form)
  'ET' is all the requested words > the query I use is "word AND word AND word"
  'OU' is any of the requested words > "word OR word OR word"
  'SAUF' is none of the words > "NOT word AND NOT word AND NOT word"

The first two work just fine, but the last one never returns anything, even in combination with other query requirements:
e.g.:
{'sort_on': 'dateSignature', 'cps_filter_sets': {'operator': 'and', 'query': ['searchable']}, 'portal_type': ('dbr_loi', 'dbr_loi_partie'), 'path': '/DBR/sections', 'dateSignature': {'query': ['8/3/2003', '8/3/2010'], 'range': 'minmax'}, 'title': 'NOT workflow '}
does not return anything, even though
{'sort_on': 'dateSignature', 'cps_filter_sets': {'operator': 'and', 'query': ['searchable']}, 'portal_type': ('dbr_loi', 'dbr_loi_partie'), 'path': '/DBR/sections', 'dateSignature': {'query': ['8/3/2003', '8/3/2010'], 'range': 'minmax'}}
does, and the results don't all have 'workflow' in their title
 
Must there necesarily be a inclusive term in the ZCTextIndex query?
Is there a super-wildcard that includes everything?
 
I noticed * and ? can only be used with at least one letter before them, so "* AND NOT word" doesn't work either...
 
TIA,
Jonathan
 


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