Hi Lindsay,
You can use the "On-site search keywords" report in the reporting module to see what your customers are searching for.
https://docs.kentico.com/k9/on-line-marketing-features/web-analytics/viewing-web-analytics-reports
There's also an option use the "Any word or synonyms" search mode. This will cause search to automatically use synonyms of the search phrases. This might have a broader effect than desired, because every word is expanded into its synonyms as defined by the WordNet lexical database.
https://docs.kentico.com/k8/configuring-kentico/setting-up-search-on-your-website/configuring-search-assistance-features
If you want more control, it may be easier to add additional tags or keywords to the content that is being searched.
Mike