function wpse66815_search_query_string( $wp_query ) {
	if (!is_admin() && is_search()) {

		//print_r($search);

		global $wp_query,$wpdb;

		// get search term
		$search_term = $wp_query->query_vars['s'];

		//print_r($search_term);

		// specify string we'll use to replace
		$replace_var = 'TL';

		// find matches for that string
		preg_match_all("/{$replace_var}(?:[^0-9]*)(\d+)/i", $search_term, $out);

		// if there's no matches, return the normal search
		if ( empty($out[0]) )
			return $wp_query;

		// find/generate the search term with the replacement
		$modified_search_term = preg_replace(
			 "/{$replace_var}(?:[^0-9]*)(\d+)/i"
			,"{$replace_var}-$1"
			,$search_term
		);


		// combine both the regular and modified search term
		$new_search[] = $search_term;
		$new_search[] = $modified_search_term;

		//print_r($new_search);

		// set $search equal to results
		$wp_query->query_vars['s'] = implode(' ',$new_search);

		//print_r($search);*/
	}
	return $wp_query;
}
add_filter('relevanssi_modify_wp_query', 'wpse66815_search_query_string');