Try your search with a different keyword or use * as a wildcard.
{
"Group": "Search provider",
"FriendlyName": "Lucene search provider",
"SystemName": "Search.Lucene",
"Version": "4.90.1",
"SupportedVersions": [ "4.90" ],
"Author": "nopCommerce team",
"DisplayOrder": 1,
"FileName": "Nop.Plugin.Search.Lucene.dll",
"Description": "This plugin provides full-text product search using the Lucene search engine"
}