Hi,
You can run the
Keywords Performance Report with a predicate on either the AdGroupId or AdGroupName to get a report that breaks down keywords on a certain ad group or ad groups.
For example, this is what your query may look like:
SELECT Criteria, Impressions, Clicks FROM KEYWORDS_PERFORMANCE_REPORT WHERE AdGroupName = "YOUR_ADGROUP_NAME" DURING LAST_WEEK
Cheers,
Anthony
AdWords API Team