Take a long-distance bus to Guangzhou Tianhe Bus Terminal, get off at Dongguan Bus Terminal, walk to Dongguan Bus Terminal (inside the station), and then transfer to Bus No.75 (you don't have to stop without raising your hand, get off first), Bus No.70 (take 17 station), Bus No.65438, and get to Dongguan-Ying Xing.
It will take about two hours.