Google launched a new AdWords reporting feature named AdWords Search Funnels. AdWords Search Funnel shows you all the keywords that assisted in conversion made through Google AdWords, rather than just the last one before a buy or conversion action. This feature is being rolled out over the next few weeks, so keep an eye out for it.
Until now, Google would only show you the last keywords that led to a conversion. In many cases, searchers will go through a searching process that includes research that might not lead to an immediate sale but may assist in a sale after a few more searches.