Can I Travel to Macao with Hong Kong Tourist visa (VOA)

Hi,
I am in Indian (working in Singapore) travelling to Hong kong this weekend. I have return tickets from Singapore to Hong Kong and Hong Kong to Singapore.

I will take a visit in Hong Kong. Can I visit Macao with the same entry permit or any separate visit entry permit and come back to Hong Kong for travelling to Singapore?

What documents should I need to submit for Hong Kong VOA.