It looks like your segment should work. Can you try in the “Visitor Log” to see if there is any visitor matching your request? (Select “Year” maybe to increase the log)
Good news: we have now released the Custom Reports feature for Piwik!
Custom reports lets you choose which dimensions and metrics you want to see. You can combine multiple dimensions (up to 3) and as many metrics as you need.
The custom reports can be emailed to your partners or customers, and have their own menu entry in the Piwik report list. You can even setup advanced filters to further customise the reports.