GW 2012 "Find" hit or miss

Is it just me, or is the "Find" feature in GroupWise very scattershot? I have noticed, across installations and versions, large inconsistencies when searching for emails containing keywords. Many emails will be listed, but others simply won't. For example, a search for the word "network" will turn up a lot of results, but will also miss a lot. Is there something fundamental that I (or my systems admins) are missing?