Use google auto complete address form in HK address(include district)

In my website, there is a form that allow user to enter their home address. I now plan to use google auto-complete address form, to get their buildings and district as well. The district is important for my company for doing some internal statistics. In HK, there are 18 districts. Currently, I am watching this now. enter link description here google auto complete address

But unfortunately, the form does not output back the district.

Can anyone help? thanks.