How can I use a specific wordpress page template if certain words are used in page title [closed]

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You can adjust the template to use in the fly based on the type of page you’re viewing. https://codex.wordpress.org/Plugin_API/Filter_Reference/template_include

add_filter( 'template_include', 'portfolio_page_template', 99 );

function portfolio_page_template( $template ) {

    if ( is_page( 'portfolio' )  ) {
        $new_template = locate_template( array( 'portfolio-page-template.php' ) );
        if ( '' != $new_template ) {
            return $new_template ;
        }
    }

    return $template;
}

You could use that in conjunction with https://codex.wordpress.org/Function_Reference/get_queried_object to check out information about the page requested, like the title.

This assumes you didn’t just set your page template on the page itself.

setting Page Template