Live Search With jquery AJAX?

How can I create a live search with Jquery AJAX, I used keypress or keyup event to loop query, but if I type 3 characters or more the AJAX will do 3 times or more.

My form:

Here my AJAX:

And Here is my demo function:

function get_tour()
echo 'Do something!';
?>
<?php die(); }

And this is result when I type 3 characters:
type 3 characters
I type 2 chars:
type 2 characters
Who can help me it work 1 time no matter how many key press. Or it work fine anyway ! Thanks a lot !!

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