'Retrieve a search entry object.
Args:
ostring (str): The help topic to look for.
category (str): Limit the search to a particular help topic'

def search_help(self, ostring, help_category=None):

    ostring = ostring.strip().lower()
    if help_category:
        return self.filter(db_key__iexact=ostring, db_help_category__iexact=help_category)
    else:
        return self.filter(db_key__iexact=ostring)
