At present, only some search parameters include an option to include/excluded "unspecified" opportunities for that search parameter. This means that I can only include a value for that search parameter if I choose to not see unspecified. I should be able to select both an option for the search parameter AND unspecified. For example, the "Applicant Type" includes "Academic Institution", but then this excludes any opportunity that was posted with no information provided for that search parameter (i.e., "unspecified").