php - Wordpress search multiple tag combinations -

im trying search posts using tag-combinations can make in search form. cant combinations work.

the (checkbox) options;
colors: red, blue, black
shapes: round, square, diamond

i want display posts have these tag-combinations:
red , round
or
red , square

i tried doesn't seem work:
$query = new wp_query( 'tag=red+round,red+square' );

wordpress sees 'tag=red,round,red,square'.

anyone tip on how can work or maybe alternative route?

looks shorthand version of wp_query not work in case, try below parameters wp_query, detailed information available here: wp_query on wp codex

$args = array(     'post_type' => 'post',     'tax_query' => array(         'relation' => 'or',         array(             'taxonomy' => 'post_tag',             'field'    => 'slug',             'terms'    => array( 'red', 'round' ),             'operator' => 'and',         ),         array(             'taxonomy' => 'post_tag',             'field'    => 'slug',             'terms'    => array( 'red', 'square' ),             'operator' => 'and',         ),     ), ); $query = new wp_query( $args );