My mom and I are Vietnamese, we are flying to the US on March 6 2017 from Hanoi, Vietnam

but we gonna stopover in Taiwan for 3 days. As the flight ticket we saw online, we having 17hours layover in Guangzhou on our way to Taiwan before US. Also from Taiwan to New York we also layover in Guangzhou for 9 hours.
We are both Vietnamese passport holders but I currently working in Australia but Im not Australian and we both got US tourist visa and we can do VOA in Taiwan as we have travelled in Europe, Australia, new zealand, japan, korea...
So do we need to apply for temporary visa to travel to Guangzhou city and to get a hotel?
Thank you so much