In the Advanced Keyword Search box immediately below do the following:
1. Click on the dropdown arrow to the left of the first search window and select Subject.
2. Enter the name of a country in the first window, such as Spain.
3. Find Year below the search windows and enter a date range, e.g. 2008 and 2015.
4. Click on Submit.
The search above will result in over 300 hits. To focus your search add a term in the second search window, such as: politic*. The asterisk is a truncation symbol that will get you politics and political. This search will result in just over 100 hits.