Couldn't obtain list of matching users (searching for: คะวีนพะอ�)

DEBUG MODE

SQL Error : 1267 Illegal mix of collations (tis620_thai_ci,IMPLICIT) and (utf8mb3_general_ci,COERCIBLE) for operation 'like'

SELECT user_id FROM board_users WHERE username LIKE 'คะวีนพะอ�'

Line : 212
File : search.php