[Zope] ZCatalog question. boolean and wildcards.

Im running Zope 2.2.2 on Linux 2.2.13. When mixing boolean operators and wildcards '*' in queries within a Textindex the 'AND' operator is replaced by 'OR'. Also, the possibility of constructing nested terms using brackets seems to be not supported (contrary to the chapter 'Searching and indexing' from the Zope book). The setting is straightforward, several indexes (text-index, keyword-indexes) are used indexing a about 5000 Zclasses. Are there any patches to apply or what else can i do ? Thanks in advance. Hannes.