To locate the right longtail keywords for your campaigns, use the “Search Queries” report in Google Analytics to see the actual, real-world search queries that resulted in your AdWords ads being triggered. These are also called exact match keywords.
This provides an incredibly valuable level of insight into exactly how users are searching for the types of products or services you offer. Adding these terms to your campaigns gives you an opportunity to refine your AdWords keyword list to reach that audience with terms they are already using.
For the best results with your keyword research and website keywords, add a keyword as a “Secondary Dimension” to see which of your search queries were matching which keywords in your account.
To check longtail queries, change the “Primary Dimension” value to “Query Word Count.” This will use a space as the delimiter, providing a total count of all the words used in the search query.
You can then add those terms to your Adgroups and keywords if you have not already.