RSS feed with specific keyword

I am able to get articles as RSS feed from below url

http://wordpress_site/blog/feed

I am also able to get articles from BlogSpot with specific keywords as below

https://www.yourblogname.blogspot.com/feeds/posts/default?q=KEYWORD

I have tried to get articles from filtering with specific KEYWORD in wordpress blog but I am not able to get. What can be the URL.

I am very much newbie to wordpress.

#wordpress