You start with "Please go through the attached image first" ...
Am I supposed to study an unknown problem before you take the time to study the help pages on "Joplin" and search in particular ? This is the reason you don't get much support to your post.
You mix up two things: in the original post you say "would be great..." which means a feature request. In your answer to ajay you say "the search results are not proper for the given keyword" which means an bug. That's not the same. And on the attached image as well as from my own search results, I cannot see any incorrectness...