@Anh_Phuong_Tran Another option for you Anh if you’re not comfortable with wiring the higher AC voltage or are worried about kids fingers getting into things would be something like this 10A unit. https://www.adafruit.com/products/658 (You can probably find this cheaper on ebay.)
Thank you @JP_Roy and @marmil . I think for now, I will get something like Marc suggest since I’m not yet confortable with electronic and want it to be safe since there’s kids in the house. However thank you JP Roy for providing me the informations.
@Anh_Phuong_Tran
Holidaycoro.com is a good place to shop for LED
http://www.holidaycoro.com/Rainproof-300-5v-Dual-Output-Power-Supply-p/45.htm
Thanks @Hung_Vu ! That’s alot of Amps 
Wonder if its easy and safe to use that in the hand of a beginner like me 