About two dozen police cadets are among those involved in Wednesday's search.
Detectives suspect a serial killer but so far have no suspects.
The New Jersey escort who prompted the initial investigation is still missing. Shannan Gilbert was last seen last spring in Oak Beach, N.Y.
The bodies of four prostitutes were found along the same highway in December. A fifth body was located last week. Three more were found in the dense underbrush on Monday.
Police have not identified any of the most recent victims. They have not definitively linked them to the remains found in December.