What if Google Advanced Search produced a visual network map which showed you the salient clusters of terms related to your search? You’d then be able to click on a cluster and the search results would change to adjust to what you’re really searching for.

Ex: The network map for “weightlifting” would include many clusters, but 2 big ones would be the hypertrophic cluster (surrounded by a bunch of related terms) and toning cluster (calisthenics would be under this cluster for example). Click on either and the results will change accordingly.

This would actually work even better for subjects you don’t know much about, because Google will teach you about the salient clusters in that field. The clusters could be enhanced with popular images associated with each term. Popular clusters would display as larger than others.