These search engines can't actually remove the content off the websites the photos or video were posted on, but they can remove the link to the revenge porn post, which can help you.
Some quick links:
http://googlepublicpolicy.blogspot.ca/2015/06/revenge-porn-and-search.html
http://mashable.com/2015/07/22/microsoft-joins-google-will-remove-links-to-revenge-porn/#qvSCgXnvCOqs
https://www.yahoo.com/tech/microsoft-joins-effort-curb-revenge-porn-161425551.html
