You can easily filter your content by a search keyword. For this you need to call the endpoint SearchContents as a POST and pass the payload as below.
{
"accessToken":"[Your Access Token]",
"slug":"[Your Slug]",
"keyword":"[The search keyword]",
"IsPilotVersion":false, //Set this to true if you want to search piloted content.
"variables": //Any variables that you want to pass
{
"[Variable name]":"[Variable value]"
}
}
Once you call the endpoint, you will now get a response which will contain all the matching content.