I am using Google Alerts for a few months now. I set up a few alerts for physiotherapy jobs with some keywords like 'job' 'physiotherapy', 'vacancy' et cetera (in Dutch). But I only get once a month an alert and even then it only found some sort of news article about the profession, not anything about jobs. I cannot imagine that so little jobs are put online for this profession. Twitter search or plain Google search gives me more relevant information.

Not sure about the Google Alert if it is useful at all this way. I can manually search every day of course, but these are things I thought could be perfectly automated and done by Google Alert.