Keyword expansion can take many forms. Larger paid search programs that lean heavily on click volume tend to expand on and add keywords in bulk, favoring scale over micro-managing. For smaller programs, or when expanding keywords based on a prioritized list, taking a more methodical approach often makes more sense. To ensure effective keyword expansion and proper search query matching, search marketers should leverage modified broad match keywords, create separate ad groups, and implement a focused negative keyword strategy.
1. Limit Irrelevant Queries with Modified Broad Match
For the longest time, search marketers relied on broad match keywords to capture converting traffic from long tail queries. Historically, this was how a keyword like “hiking shoe” would lead to expanded keywords like “mens hiker shoes” or “black shoes for hiking”. Then Google introduced modified broad match, which provides search marketers with the control of phrase match and the reach of broad match. You can now maintain keyword relevance and scale negative keyword research, without sacrificing the ability to drive conversions through longer tail queries.
To leverage modified broad match, add the modifier (+) to your broad match keywords*. As a result, each keyword token that uses this modifier must appear in the search query exactly or as a close variant; this includes misspellings, plurals, abbreviations and acronyms. Though click and conversion volume may dip slightly compared the same keyword on broad match, clickthrough-rate (CTR) should drastically improve. Furthermore, spend due to irrelevant clicks will decrease as Google will stop matching your keywords to synonyms and “relevant” searches. As always, continue to generate and mine publisher search query reports for irrelevant queries and add them as negative keywords. With modified broad match keywords, you should notice a significant drop in the number of irrelevant queries found in these reports.
*As a best practice, when adding modified broad match keywords, pause existing broad match keywords (rather than delete) and create new modified broad match versions. This will allow you to maintain historical Quality Scores should you need to revert back to broad match in the future.
2. Improve Quality Score with a Separate Ad Group
As you discover new longer-tail, converting queries, add them to new ad groups. For example, if the modified broad keyword “+hiking +shoe” expands to “mens hiker shoes”, add the new keyword on exact match type to a new “Mens Hiker Shoes” ad group. This allows you to generate ad creative specific to men’s hiker shoes, rather than relying on the fairly generic hiking shoes ad creative. Always generate new ad creative and incorporate the keyword into the ad as much as possible. If a higher quality landing page exists, be sure to leverage that as well to improve Quality Score. Introduce new keywords with an aggressive initial bid. A high average position and CTR will go a long way in establishing a strong Quality Score.
As more keywords convert, and are expanded upon and placed into their own ad groups, the original modified broad match keyword will become less and less profitable. Keep this in mind as part of your bidding strategy. Set appropriate goals for these modified broad keywords and continue to leverage them more for keyword expansion rather than hitting business targets.
3. Shape Traffic with Exact Match Negative Keywords
The most critical step when adding expanded keywords to a new ad group is remembering to add the exact match negative of that same keyword to the original ad group. In our example above, the new exact match keyword “mens hiker shoes” was added to the new “Mens Hiker Shoes” ad group. As a result, the exact match negative keyword “-mens hiker shoes” should be added to the original “Hiking Shoes” ad group. This forces Google to match the query to the exact match keyword, rather than the modified broad match keyword. In other words, a search for “mens hiker shoes” will match to the “mens hiker shoes” exact match keyword, and not “+hiking +shoe”. If the exact match negative keyword isn't added to the old ad group, it’s possible that Google will incorrectly match queries to modified broad keywords based on a number of factors, including max cost-per-click (CPC) or Quality Score.
For additional best practices on keyword expansion and how to maximize keyword opportunities, click here.
For an introduction to competitive keyword analysis, click here.