Change search so that searching for cat_dog returns only pages w/cat_dog, instead of pages with cat &/or dog

We have a number of Confluence pages which include data table names whose component words are separated by underscores, e.g., cat_dog. However, we cannot search for pages that contain cat_dog without getting all pages that contain cat &/or dog.
In an e-mail response to my http://confluence.atlassian.com/display/DOC/Confluence+Search+Syntax?&#comments question, Komathi Krishnan [Atlassian] indicated this is related to the Lucene indexing service (and consequently is likely present in all versions of Confluence using it). If a change could be made to allow searching for only pages containing underscore_separated strings, that would be appreciated.