You’ll get trapped in filter bubbles if you only match search terms found in the text because things can only be returned if somehow words match up. Most tools let you match multiple words with a single search term by using ontologies and taxonomies as a big lookup table, but this can cause useful stuff to get buried further in the results.
The Cognitive City breaks the filter bubble by doing one thing fundamentally different. It lets you find things based on how they are connected and if you know of a valuable connection to use it lets you raise those results to the top.
As you create connections between things in the City you can flag the relationships that search should use. You can even identify relationships between things that use completely different words to describe the same concepts by building conceptual spaces from free-text in narratives and descriptions.