One of the best ways to find new keywords is the Google AdWords Search Term Report. However, it’s not the only way. The Search Term Report shows what search queries triggered your ads and if they are not added as keywords yet, you can add or exclude them right then and there.
Finding keyword opportunities is becoming more and more difficult, with the markets we work in becoming even more competitive. I recently wrote a post that went through my five steps to spotting keyword opportunities using a piece of campaign management software, but there are lots of tools that can help you to spot keyword opportunities.