@Vishal *******
As Greg already said, if they see that you have traveled from India to Vietnam or Indonesia, then the visa consular officers will also wonder why you did not apply in India and will become suspicious and may look at your submitted documents a little more closely. From my experience here on the Facebook group, I have to say that applying in your home country is always safer than in the neighboring countries of Thailand. Is there any reason why you don't want to apply in India?