Sparrow for iPhone seems to only search the same fields that the Mail app does: from, to, subject, or all of them.
Given that gmail (sparrow's data source) and the sparrow Mac app both allow full text searches, and presumably the "work" is done on the gmail server side, it seems odd that you can't search the body of messages.
Am I missing something? If not, does anyone know if this might be planned for a future release?