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If you want to limit the filter from this answer (add that function to your plugin or your theme’s functions.php) just to one query, remove the filter when you are done:

add_filter( 'posts_search', '__search_by_title_only', 500, 2 );

$query = new WP_Query(
    array(
        's'         => 'mykeyword myotherkeyword',
        'cat'       => array( 22, 32 ),
        'orders'    => 'DESC',
        'showposts' => 6
    )
);

remove_filter( 'posts_search', '__search_by_title_only', 500 );

if ( $query->have_posts() ) :
    while ( $query->have_posts() ) :
        $query->the_post();
        the_title( '<p>', '</p>' );
    endwhile;

    wp_reset_postdata();
endif;

If you want to limit the filter from this answer (add that function to your plugin or your theme’s functions.php) just to one query, remove the filter when you are done:

add_filter( 'posts_search', '__search_by_title_only', 500, 2 );

$query = new WP_Query(
    array(
        's'         => 'mykeyword myotherkeyword',
        'cat'       => array( 22, 32 ),
        'orders'    => 'DESC',
        'showposts' => 6
    )
);

remove_filter( 'posts_search', '__search_by_title_only', 500 );

if ( $query->have_posts() ) :
    while ( $query->have_posts() ) :
        $query->the_post();
        the_title( '<p>', '</p>' );
    endwhile;

    wp_reset_postdata();
endif;

If you want to limit the filter from this answer just to one query, remove the filter when you are done:

add_filter( 'posts_search', '__search_by_title_only', 500, 2 );

$query = new WP_Query( 's=mykeyword&cat=22,32&order=dsc&showposts=6' );

remove_filter( 'posts_search', '__search_by_title_only', 500 );

if ( $query->have_posts() ) :
    while ( $query->have_posts() ) :
        $query->the_post();
        the_title( '<p>', '</p>' );
    endwhile;

    wp_reset_postdata();
endif;

If you want to limit the filter from this answer (add that function to your plugin or your theme’s functions.php) just to one query, remove the filter when you are done:

add_filter( 'posts_search', '__search_by_title_only', 500, 2 );

$query = new WP_Query( 
    array(
        's'         => 'mykeyword myotherkeyword',
        'cat'       => array( 22, 32 ),
        'orders'    => 'DESC',
        'showposts' => 6
    )
);

remove_filter( 'posts_search', '__search_by_title_only', 500 );

if ( $query->have_posts() ) :
    while ( $query->have_posts() ) :
        $query->the_post();
        the_title( '<p>', '</p>' );
    endwhile;

    wp_reset_postdata();
endif;

If you want to limit the filter from this answer just to one query, remove the filter when you are done:

add_filter( 'posts_search', '__search_by_title_only', 500, 2 );

$query = new WP_Query( 's=mykeyword&cat=22,32&order=dsc&showposts=6' );

remove_filter( 'posts_search', '__search_by_title_only', 500 );

If you want to limit the filter from this answer just to one query, remove the filter when you are done:

add_filter( 'posts_search', '__search_by_title_only', 500, 2 );

$query = new WP_Query( 's=mykeyword&cat=22,32&order=dsc&showposts=6' );

remove_filter( 'posts_search', '__search_by_title_only', 500 ); 

if ( $query->have_posts() ) :
    while ( $query->have_posts() ) :
        $query->the_post();
        the_title( '<p>', '</p>' );
    endwhile;

    wp_reset_postdata();
endif;