Regarding the debris identified by the Chinese; it must be noted that the images were retrieved some time on Sunday, and the debris will have since moved due to a surface current flowing in a SSE/SE direction at up to 0.25 m/s from the location given, i.e.
6°42'N 105°38'E
I daresay that aviation and marine assets will take the above into account when they go searching shortly after sunrise in about 30 mins.