I have posted in related threads that someone Tweeted soon after news of the plane being ‘lost’ that it had landed in the south part of Vietnam.
Considering that the officials and media have claimed debris fields in several opposing directions and different mileages, that the plane may have been taken over and landed in some remote locations seems as valid as the other claims.
There was also a news report that the plane landed in Nanjing China at 9:30 am. This report was quickly pulled.