When I tried to retrieve data for my bibliometric project from Scopus database using the keywords on a particular topic I received some results. Later I realized that articles on some sub-constructs of the topic do not reflect in the result as they have become independent of the parent topic and grown into their own domains. The problem is that they still come under the scope of the definition of my study. So, should I include the constructs as a part of my keyword search along with topic keywords?