I've searching this issue for about 2 days, so I'm really appreciate your help.
First, I create account at Google Merchants Center and linked it with my site.
The Product Feed is also works well ( I'm using prestashop, so the input methods is "E-Commerce platform imports".
As shown in image above, the status is successful.
After that, I create a campaign (max CPC and budget are already created), but here is the result:
Is there any step that I miss that caused the products doesn't listed?
After Days, I finally found it.
I've just aware that I made a mistake in "Attributes" the value of my site category doesn't being recognized by Google, so I have to create a new one based on the template from google itself.
After I re-fetch the feed, there are some changes happens. You can compare these below images with above images.
And finally... the products show up.