That is because how Obsidian prioritizes searches. It will prioritize notes that equal the string you type, then these that start with the string you type, then these that contain the string you type somewhere…
Rather than having emoji in your title, you could use the emoji in links in other notes where it is visually relevant, like
🔥 [[Helloworld]]
And of course, you could also explicitly add a first level title including the emoji at the top of the note.
Alternatively, start your search with the emoji - but definitely, this is not practical.