Hello, @Tuyen Van,
In order to know how to set the product category and brand filter please watch this complete video: https://streamable.com/1fi8ve and follow the steps for a better reference.
Further, you can watch this video: https://www.youtube.com/watch?v=Je2rCPXBQMw&list=PLMqMSqDgPNmCCyem_z9l2ZJ1owQUaFCE3&index=3
Regards 8Themes Team.