[Zope] Searching phrases flakey in Zope?

[Simon Blandford]

I noticed that searching for phrases i.e. "search strings in quotes" 
with Products which use ZCatalog seems to produce undesired results.

Two words in quotes is fine,
Three words seems to yield spurious matches as if it is matching any of 
the words *in* the quotes,
More than three words in quotes doesn't match anything even though the 
phrase is definitely in the documents being searched.

Mixing words, boolean an quotes is a complete disaster and I have no 
idea what it is or isn't matching e.g.
fred and andy not bob and "over the hill and beyond"

Interestingly, if I use the search box on the Zope site itself phrases 
work fine as long as they are in *single* quotes. This doesn't work on 
my own Zope installation however. Also booleans seem to need to be in 
capitals i.e. AND and NOT.

Has anyone else experienced this?
Is it behaving normally but I just don't understand it?
Why is the Zope site itself different?

Why I am being so pedantic? Well I have a Document Library which can not 
be split easily into topics so it relies very heavily on text searches. 
For it to work these searches need to be quite specific, like you can do 
on Google or Altavista. I often mix boolean, words and phrases when 
using internet search engines and can narrow things down quite well that 
way.

Regards,
Simon B.