From USAJOBS Help
Enter all or part of a Job Title that you would like to see. You will maximize your chances to get better results if you know the exact title of the position. Otherwise, the system will match as many words of the job title as possible to give you a relevant search result list. For example, entering â€śAuditorâ€ť will retrieve all Job Titles with the word â€śauditorâ€ť ,yet it will also retrieve other titles with â€śauditorâ€ť in it as well, including â€śSupervisory Auditorâ€ť and â€śInformation Systems Auditorâ€ť, among others.