There is any bus recommendations from Sanshui to Guangzhou?

Of course. There are many buses from Sanshui Bus Station to Guangzhou and they are available between 06:00 and 19:30. The bus fare is CNY20 and it takes 50-60min. Or you can take a high speed train from Sanshui South Train Station to Guangzhou South within half an hour, and it costs CNY15 for a second class seat and CNY19 for a first class seat.