diff --git a/inc/class-wooviet-notices.php b/inc/class-wooviet-notices.php
new file mode 100644
index 0000000..830d66e
--- /dev/null
+++ b/inc/class-wooviet-notices.php
@@ -0,0 +1,107 @@
+<?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * Manage the notices of the plugin
+ *
+ * @author   htdat
+ * @since    1.3.1
+ *
+ */
+class WooViet_Notices {
+
+	var $settings = '';
+
+	var $default_settings = array(
+		'installation_time'               => 0,
+		'displaying_survey_after_4_weeks' => 'not_yet',
+	);
+
+	/**
+	 * WooViet_Notices constructor.
+	 */
+	public function __construct() {
+		$this->settings = self::get_settings();
+		$this->set_installation_time();
+		$this->manage_displaying_survey_after_4_weeks();
+
+	}
+
+	public function get_settings() {
+		$settings = get_option( 'woo-viet_notices', self::$default_settings );
+		$settings = wp_parse_args( $settings, self::$default_settings );
+
+		return $settings;
+	}
+
+	/**
+	 * Set the installation time
+	 */
+	public function set_installation_time() {
+		if ( ! $this->settings['installation_time'] ) {
+			$this->settings['installation_time'] = time();
+			$this->save_settings();
+		}
+	}
+
+	/**
+	 * Save settings for this classe
+	 */
+	public function save_settings() {
+		update_option( 'woo-viet_notices', $this->settings );
+	}
+
+	/**
+	 * Manage the notice 'displaying_survey_after_4_weeks'
+	 */
+	public function manage_displaying_survey_after_4_weeks() {
+		$display_time = $this->settings['installation_time'] + ( 4 * 7 * 24 * 60 * 60 ); // 4 weeks; 7 days; 24 hours; 60 mins; 60 secs
+
+		// Manage the dismiss action
+		if ( isset( $_GET['wooviet_dismiss'] )
+		     &&
+		     ( 'displaying_survey_after_4_weeks' == $_GET['wooviet_dismiss'] )
+		) {
+			$this->settings['displaying_survey_after_4_weeks'] = 'done';
+			$this->save_settings();
+		}
+
+		// Display the message
+		if ( $display_time < time() &&
+		     'not_yet' == $this->settings['displaying_survey_after_4_weeks']
+		) {
+
+			add_action( 'admin_notices', array( $this, 'add_displaying_survey_after_4_weeks' ) );
+
+		}
+	}
+
+	/**
+	 * The HTML code to display in the admin notice
+	 */
+	public function add_displaying_survey_after_4_weeks() {
+
+		$line1 = __( 'Please help us to improve Woo Viet.', 'woo-viet' );
+		$line2 = __( 'Rate us!', 'woo-viet' );
+		$line3 = __( 'Or run a short survery:', 'woo-viet' );
+		$line4 = '<a href="http://vn.com" target="_blank">tiếng Việt</a> - <a href="http://en.com" target="_blank">English</a>';
+		$line5 = __( 'Dismiss this notice', 'woo-viet' );
+		$link  = admin_url( 'admin.php?page=woo-viet&wooviet_dismiss=displaying_survey_after_4_weeks' );
+
+		printf( '
+			<div class="notice notice-success"> 
+				<p><strong>%1$s</strong></p>
+				<p><strong>
+					<a href="https://wordpress.org/support/plugin/woo-viet/reviews/?filter=5#new-post" target="_blank">%2$s</a> %3$s %4$s
+				</strong></p>
+				<p>
+					<a href="%6$s">%5$s</a>
+				</p>
+			</div>	    
+	    ', $line1, $line2, $line3, $line4, $line5, $link );
+	}
+
+}
\ No newline at end of file
diff --git a/woo-viet.php b/woo-viet.php
index 0c03111..820d66b 100644
--- a/woo-viet.php
+++ b/woo-viet.php
@@ -133,6 +133,10 @@ class WooViet {
 			include( WOO_VIET_DIR . 'inc/class-wooviet-admin-page.php' );
 			$this->Admin_Page = new WooViet_Admin_Page();
 
+			// Add the notices class
+			include( WOO_VIET_DIR . 'inc/class-wooviet-notices.php' );
+			new WooViet_Notices();
+
 		}
 
 		$settings = self::get_settings();