As the message clearly states that you have to narrow down the issue to get it solved. Could you please let us know what is the requirement for ur search? Could you please tell us where you had preformed this search condition?
Are you specifically looking for the last30d for the particular user irrespective of the job status (or) are you only looking for the user who has submitted last 30d jobs alone? Could you share more information on your requirement to help you further?