Hi,

If you are looking to get the list of products supplied by a customer, activate the advance search option , then from the filter click on Add custom filter,  then add a filter like this " vendors" "contains" "camptocamp"

Then you will get the products supplied by this Vendor.

If you want to take print out of this after filtering switch to tree view and you can print it using this community module.

https://www.odoo.com/apps/modules/10.0/web_export_view/

Thanks