"A team of 35 investigators scoured about 30 square miles of canyons, fields and hills in southeastern Alameda County on Friday, but came up empty-handed in a search for missing nursing student Michelle Le."
http://www.contracostatimes.com/bay-area-news/ci_18251351
Another article about the search. FWIW, I think you would have to have specific knowledge to find a body in the canyon, it has roads and residences, but it's still very wild, woodsy, rocky, and steep.
http://unioncity.patch.com/articles...-for-michelle-les-body-with-no-luck?ncid=M255