As far as finding MH370 debris cast ashore, how about publicizing what likely (best guesses) debris would look like and offering a cash reward for the first confirmed find? Offering to pay for things often works a treat.
International "Law of Finds" covers this very well.
Looking at the taphonomy, the Ocean surface currents will keep any debris very near to the source, small movements towards the East, but wind driven lighter material is a different matter.