Happy Halloween! I’ll just leave this here. If anyone can make sense of what LinkedIn Job Search does in the two screenshots below, please get in touch. (As with people search, I have no idea. LinkedIn Developers have started to write code in mysterious ways.)
(I doubt there is anything underlying here like in the Google case with quotes. It is a coincidence that quotes add results in both observed cases.)
The conclusion for now is – do not trust the job search function. If you want to search for a job on LinkedIn, do so via Google, like
Note that even if they fix the LinkedIn Job Search Dialog algorithm, it does not let you to search by job title, while Google does – put the desired role keywords under the intitle: operator.