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CREATE TABLE products
( product_id int
, product_name VARCHAR(20)
, product_name_vi VARCHAR(20) COLLATE Vietnamese_CI_AS );

INSERT INTO products VALUES (1, 'Chang', 'Chang')

SELECT * FROM products WHERE product_name like '_____'
SELECT * FROM products WHERE product_name_vi like '___'
product_id product_name product_name_vi
1 Chang Chang
product_id product_name product_name_vi
1 Chang Chang