You can view reports by individual campaign or for all campaigns.
To view a report for an individual campaign, click on the Campaigns & Bid By Domain tab in the left rail in the Advertising section.
Then locate the campaign you want to review. Click on the box arrow to the left of the campaign and select View Report to populate the report.
To view all campaigns in one view, click on Campaign Summary in the Reporting section at the top left of the screen.
You will see the Campaigns Report page default which shows data on all campaigns (You can also view an individual campaign by using the Campaigns drop-down menu).
Data is shown graphically at the top of the screen and allows you to adjust the Date Range as well as view data by Impressions, Clicks, CTR, Spend, eCPC, Conversions, and eCPA.
Below the graph view, you will notice a linear data view, which allows you to filter your results by Day, Campaign and by Content. You can sort any of the data points by clicking on the column headlines.
Campaigns can also be sorted by Time (Day or Hour), Impressions, Clicks, CTR, Spend, eCPC or eCPA.