The purpose of this study was to define the workings of broad match keyword features in the search for product advertisements and how the broad match keyword feature analysis works, as well as designing databases with application prototypes in the form of Application Programming Interface (API). The design method used is DSDLC (Database System Development Lifecycle). The results achieved in this study are application prototypes in the form of Application Programming Interface (API). This study found the fact that the broad match ad keyword system was based on the ad keyword search feature at PT. XYZ has not been able to search for keywords without regard to the order of the search keywords. Based on this, this study determines the workings of broad match keyword features by applying the search rules broad matching, synonym, and stemming into the existing ad keyword search system. Keyword analysis uses the rules of broad matching, synonym, and stemming. The results can be implemented in the form of ElasticSearch analyzer.