tai sao nguoi giau ngui ngheo

https://www.youtube.com/watch?v=bd5vhCJoERQ

3.20--> giai thich  chan ly toi da....32m30



https://www.youtube.com/watch?v=7hz9UDRk9vg

( tai sao nguoi ngheo nguoi giau



https://www.youtube.com/watch?v=TJ_IBl5R608&t=1887s
(giai quyet o tam