Please help. It’s not work for me

I actived plugin and added code in functions.php

add_filter( 'woocommerce_states', 'vietnam_cities_woocommerce' );
function vietnam_cities_woocommerce( $states ) {
  $states['VN'] = array(
    'HOCHIMINH' => __('H? Chí Minh', 'woocommerce') ,
    'HANOI' => __('Hà N?i', 'woocommerce') ,
    'HAIPHONG' => __('H?i Phòng', 'woocommerce') ,
    'DANANG' => __('?à N?ng', 'woocommerce') ,
    'CANTHO' => __('C?n Th?', 'woocommerce') ,
    'ANGIANG' => __('An Giang', 'woocommerce') ,
    'BARIAVUNGTAU' => __('Bà R?a - V?ng Tàu', 'woocommerce') ,
    'BACLIEU' => __('B?c Liêu', 'woocommerce') ,
    'BACKAN' => __('B?c K?n', 'woocommerce') ,
    'BACNINH' => __('B?c Ninh', 'woocommerce') ,
    'BACGIANG' => __('B?c Giang', 'woocommerce') ,
    'BENTRE' => __('B?n Tre', 'woocommerce') ,
    'BINHDUONG' => __('Bình D??ng', 'woocommerce') ,
    'BINHDINH' => __('Bình ??nh', 'woocommerce') ,
    'BINHPHUOC' => __('Bình Ph??c', 'woocommerce') ,
    'BINHTHUAN' => __('Bình Thu?n', 'woocommerce'),
    'CAMAU' => __('Cà Mau', 'woocommerce'),
    'DAKLAK' => __('?ak Lak', 'woocommerce'),
    'DAKNONG' => __('?ak N?ng', 'woocommerce'),
    'DIENBIEN' => __('?i?n Biên', 'woocommerce'),
    'DONGNAI' => __('??ng Nai', 'woocommerce'),
    'GIALAI' => __('Gia Lai', 'woocommerce'),
    'HAGIANG' => __('Hà Giang', 'woocommerce'),
    'HANAM' => __('Hà Nam', 'woocommerce'),
    'HATINH' => __('Hà T?nh', 'woocommerce'),
    'HAIDUONG' => __('H?i D??ng', 'woocommerce'),
    'HAUGIANG' => __('H?u Giang', 'woocommerce'),
    'HOABINH' => __('Hòa Bình', 'woocommerce'),
    'HUNGYEN' => __('H?ng Yên', 'woocommerce'),
    'KHANHHOA' => __('Khánh Hòa', 'woocommerce'),
    'KIENGIANG' => __('Kiên Giang', 'woocommerce'),
    'KOMTUM' => __('Kom Tum', 'woocommerce'),
    'LAICHAU' => __('Lai Chau', 'woocommerce'),
    'LAMDONG' => __('Lam ??ng', 'woocommerce'),
    'LANGSON' => __('L?ng S?n', 'woocommerce'),
    'LAOCAI' => __('Lào Cai', 'woocommerce'),
    'LONGAN' => __('Long An', 'woocommerce'),
    'NAMDINH' => __('Nam ??nh', 'woocommerce'),
    'NGHEAN' => __('Ngh? An', 'woocommerce'),
    'NINHBINH' => __('Ninh Bình', 'woocommerce'),
    'NINHTHUAN' => __('Ninh Thu?n', 'woocommerce'),
    'PHUTHO' => __('Phú Th?', 'woocommerce'),
    'PHUYEN' => __('Phú Yên', 'woocommerce'),
    'QUANGBINH' => __('Qu?ng Bình', 'woocommerce'),
    'QUANGNAM' => __('Qu?ng Nam', 'woocommerce'),
    'QUANGNGAI' => __('Qu?ng Ng?i', 'woocommerce'),
    'QUANGNINH' => __('Qu?ng Ninh', 'woocommerce'),
    'QUANGTRI' => __('Qu?ng Tr?', 'woocommerce'),
    'SOCTRANG' => __('Sóc Tr?ng', 'woocommerce'),
    'SONLA' => __('S?n La', 'woocommerce'),
    'TAYNINH' => __('Tay Ninh', 'woocommerce'),
    'THAIBINH' => __('Thái Bình', 'woocommerce'),
    'THAINGUYEN' => __('Thái Nguyên', 'woocommerce'),
    'THANHHOA' => __('Thanh Hóa', 'woocommerce'),
    'THUATHIENHUE' => __('Th?a Thiên - Hu?', 'woocommerce'),
    'TIENGIANG' => __('Ti?n Giang', 'woocommerce'),
    'TRAVINH' => __('Trà Vinh', 'woocommerce'),
    'TUYENQUANG' => __('Tuyên Quang', 'woocommerce'),
    'VINHLONG' => __('V?nh Long', 'woocommerce'),
    'VINHPHUC' => __('V?nh Phúc', 'woocommerce'),
    'YENBAI' => __('Yên Bái', 'woocommerce'),
  );
  return $states;
}

Then I created file VN.php in wp-content/plugins/wc-city-select/cities folder

<?php
/**
 * Vietnam cities
 */
global $cities;

$cities['VN'] = array(
        'HOCHIMINH' => array(
            'Qu?n 01',
			'Qu?n 02',
			'Qu?n 03'
        ),
        'HANOI' => array(
            'Qu?n Ba ?ình',
			'Qu?n C?u Gi?y',
			'Qu?n ??ng ?a'
        ),
		'HAIPHONG' => array('Arauca'),
		'DANANG' => array('Baranoa'	),
		'CANTHO' => array('Achí'),
		'ANGIANG' => array('Almeida'),
		'BARIAVUNGTAU' => array('Viterbo'),
		'BACLIEU' => array('Valparaiso'),
		'BACKAN' => array('Yopal'),
		'BACNINH' => array('Villa Rica'),
		'BACGIANG' => array('Valledupar'),
		'BENTRE' => array('Unión Panamericana (áNIMAS)'),
		'BINHDUONG' => array('Valencia'),
		'BINHDINH' => array('Zipaquirá'),
		'BINHPHUOC' => array('Inírida'),
		'BINHTHUAN' => array('San José del Guaviare'),
		'CAMAU' => array('Yaguará'),
		'DAKLAK' => array('Villanueva'),
		'DAKNONG' => array('Zona Bananera (PRADO - SEVILLA)'),
		'DIENBIEN' => array('Vista Hermosa'),
		'DONGNAI' => array('Yacuanquer'),
		'GIALAI' => array('Villa del Rosario'),
		'HAGIANG' => array('Villagarzón'),
		'HANAM' => array('Salento'),
		'HATINH' => array('Santuario'),
		'HAIDUONG' => array('Providencia'),
		'HAUGIANG' => array('Zapatoca'),
		'HOABINH' => array('Tolú Viejo'),
		'HUNGYEN' => array('Villarrica'),
		'KHANHHOA' => array('Zarzal'),
		'KIENGIANG' => array('Taraira'),
		'KOMTUM' => array('Santa Rosalía'),
		'LAICHAU' => array('Santa Rosalía'),
		'LAMDONG' => array('Santa Rosalía'),
		'LANGSON' => array('Santa Rosalía'),
		'LAOCAI' => array('Santa Rosalía'),
		'LONGAN' => array('Santa Rosalía'),
		'NAMDINH' => array('Santa Rosalía'),
		'NGHEAN' => array('Santa Rosalía'),
		'NINHBINH' => array('Santa Rosalía'),
		'NINHTHUAN' => array('Santa Rosalía'),
		'PHUTHO' => array('Santa Rosalía'),
		'PHUYEN' => array('Santa Rosalía'),
		'QUANGBINH' => array('Santa Rosalía'),
		'QUANGNAM' => array('Santa Rosalía'),
		'QUANGNGAI' => array('Santa Rosalía'),
		'QUANGNINH' => array('Santa Rosalía'),
		'QUANGTRI' => array('Santa Rosalía'),
		'SOCTRANG' => array('Santa Rosalía'	),
		'SONLA' => array('Santa Rosalía'),
		'TAYNINH' => array('Santa Rosalía'),
		'THAIBINH' => array('Santa Rosalía'),
		'THAINGUYEN' => array('Santa Rosalía'),
		'THANHHOA' => array('Santa Rosalía'),
		'THUATHIENHUE' => array('Santa Rosalía'),
		'TIENGIANG' => array('Santa Rosalía'),
		'TRAVINH' => array('Santa Rosalía'),
		'TUYENQUANG' => array('Santa Rosalía'),
		'VINHLONG' => array('Santa Rosalía'),
		'VINHPHUC' => array('Santa Rosalía'),
		'YENBAI' => array('Santa Rosalía')
);

Here is result:

Please help me to solve this problem. I’t urgent.

Many thanks.