How to get all list items by LookupSPListItem in Visual Studio workflow?

Dear all,

I'm working on SharePoint-hosted app and have two lists (A and B) and a workflow (activate in list A).

And, I have data in the list B and would like to get all of them in workflow.

I try to use LookupSPListItem to retrieve them, but only get the first one.

Also try to use CountDynamicValueItems, but the number is still 1.

Is anyone knows how to get all the list items in workflow?

Thanks!