Hi Giang,
I have two suggestions for Eshop, which should be quite easy to implement for you, I guess.
First suggestion:
It would be nice to have the order overview extended with the invoicenumber, see screenshot.
In The Netherlands customers usually refer to the invoicenumber in stead of the order number (ID).
So it's much easier to identify the order with the invoicenumber shown in the overview.
Second suggestion:
It would be nice to have the customergroup visible in the customeroverview.
My customer has created plenty customergroups, but at the moment is not easy to see in which customergroup a customer belongs, besides opening the record and check at that point.
Added: and of course a filter for quick overview of specific customergroups.
Best regards,
Burt
Running Joomla! 3.4.1 with Eshop 1.3.7 (which is amazing!)