Product Search – including keywords

Hi,
I am quite happy with the following code inside my searchform.php (child theme), because I just get the search results from my product.
I got this from another topic in this forum.

<?php 

global $avia_config; 

//allows you to modify the search parameters. for example bbpress search_id needs to be 'bbp_search' instead of 's'. you can also deactivate ajax search by setting ajax_disable to true
$search_params = apply_filters('avf_frontend_search_form_param', array(
	
	'placeholder'  	=> __('Produktsuche','avia_framework'),
	'search_id'	   	=> 's',
	'form_action'	=> home_url( '/' ),
	'ajax_disable'	=> false
));

$disable_ajax = $search_params['ajax_disable'] == false ? "" : "av_disable_ajax_search";

$icon  = av_icon_char('search');
$class = av_icon_class('search');
?>
<form role="search" method="get" id="searchform" action="<?php echo home_url( '/' ); ?>">
			<div>
				<label class="screen-reader-text" for="s">Search for:</label>
				<input type="text"  name="s" id="s" placeholder='<?php echo $search_params['placeholder']; ?>' />
				<input type="submit" id="searchsubmit" value="<?php echo $icon; ?>" class="button <?php echo $class; ?>" />
				<input type="hidden" name="post_type" value="product">
			</div>
</form>

Now the question: Can the keywords been easily included to the search result? (e.g. I just have one keyword which is a synonymy of the product.)

Thanks in advance!
JP