Tiki uses Facets in conjunction with Elasticsearch or Manticore Search and other tools like PluginCustomSearch to improve the search interface and results.
"Faceted search, also called faceted navigation or faceted browsing, is a technique for accessing information organized according to a faceted classification system, allowing users to explore a collection of information by applying multiple filters. A faceted classification system classifies each information element along multiple explicit dimensions, called facets, enabling the classifications to be accessed and ordered in multiple ways rather than in a single, pre-determined, taxonomic order." Source: https://en.wikipedia.org/wiki/Faceted_search
This is configured at tiki-admin.php?page=search -> Search Results