Bookmarklet search for the Evernote contents. This is for "beta web editor", you must switch to beta editor previously.
javascript:(function(){var o=' notebook:"my notebook"',s=window.prompt("Search for Evernote"),u;if(!s)return;u="https://www.evernote.com/client/web#?query="+s+o;location.href=encodeURI(u);})();