Xcode อยากให้ UISearchBar มัน search ได้มากกว่า 1 อย่าง ต้องทำยังไงคับ

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    
    if([searchString length] == 0)
    {
        [displayObject removeAllObjects];
        [displayObject addObjectsFromArray:allObject];
    }
    else
    {
        [displayObject removeAllObjects];
        for(NSDictionary *tmpDict in allObject)
        {
            NSString *val = [tmpDict objectForKey:provincename];
            
            NSRange r = [val rangeOfString:searchString options:NSCaseInsensitiveSearch];
            if(r.location != NSNotFound)
            {
                [displayObject addObject:tmpDict];
            }
        }
    }
    
    return YES;
}