i have form search :
<form action="<?php echo esc_url( home_url( '/' ) ); ?>" method="GET" role="form" class="searchform">
<div class="row">
<div class="col-md-3">
<input type="hidden" name="post_type" value="tourdl">
<div class="item">
<label><img src="<?php bloginfo('stylesheet_directory');?>/assets/images/search-1.png" class="img-fluid" alt="">Nơi khởi hành</label>
<input type="search" name ="noi_kh" placeholder="<?php echo esc_attr_x( 'Search …', 'placeholder' ); ?>">
</div>
</div>
<div class="col-md-3">
<div class="item">
<label><img src="<?php bloginfo('stylesheet_directory');?>/assets/images/search-2.png" class="img-fluid" alt="">Điểm đến</label>
<input type="search" name ="den" placeholder="Nhập nơi đến ...">
</div>
</div>
<div class="col-md-3">
<div class="item">
<label><img src="<?php bloginfo('stylesheet_directory');?>/assets/images/search-3.png" class="img-fluid" alt="">Ngày khởi hành</label>
<div class="form-group">
<div class='input-group date date-book' id='datetimepicker2'>
<input type='search' name="ngay_kh" placeholder="Ngày / tháng / năm" class="inp_date" />
<span class="input-group-addon"></span>
</div>
</div>
</div>
</div>
<div class="col-md-3">
<div class="item">
<button type="submit" class="text-uppercase btn-search" id="searchsumit" value="<?php echo esc_attr_x( 'Search', 'submit button' ); ?>">Tìm kiếm</button>
</div>
</div>
</div>
</form>
and here is querry in search page
$post_type = isset($_GET['post_type']) && $_GET['post_type'] ? $_GET['post_type'] : 'post';
$di = isset($_GET['noi_kh']) && $_GET['noi_kh'] ? $_GET['noi_kh'] : '';
$den = isset($_GET['den']) && $_GET['den'] ? $_GET['den'] : '';
$nkh = isset($_GET['ngay_kh']) && $_GET['ngay_kh'] ? $_GET['ngay_kh'] : '';
$args = array(
'showposts' => 10,
'post_type' => $post_type,
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'noi_khoi_hanh',
'value' => $di,
'compare' => 'Like'
),
array(
'key' => 'diem_den',
'value' => $den,
'compare' =>'Like'
),
array(
'key' => 'ngay_khoi_hanh',
'value' => $nkh,
'type' => 'datetimepicker2',
'compare' => 'Like',
)
),
);
?>
have_posts() ): ?> have_posts() ) : $the_query->the_post(); ?>