How to change tab’s title in search results pages? [closed]

You have to hook into the document_title_parts filter to adjust it to your needs.

Example:

/**
 * Modify the document title for the search page
 */
add_filter( 'document_title_parts', function( $title )
{
    if ( is_search() ) 
        $title['title'] = sprintf( 
            esc_html__( '“%s” result page', 'my-theme-domain' ), 
            get_search_query() 
        );

    return $title;
} );

For Multiple paged search page you have to do like this:

/**
 * Modify the page part of the document title for the search page
 */
add_filter( 'document_title_parts', function( $title ) use( &$page, &$paged )
{
    if ( is_search() && ( $paged >= 2 || $page >= 2 ) && ! is_404() ) 
        $title['page'] = sprintf( 
            esc_html__( 'This is %s page', 'my-theme-domain' ), 
            max( $paged, $page ) 
        );

    return $title;
} );

modify the example I gave according to your need.

title-tag must be supported by your theme.