If I live in a country such as Singapore, Thailand and Malayisa where its impossible to avoid najassat from hindou and chinese people what to do? Do we have to apply the rule like in China and India?
Because most of the population are chinese

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Yes if you are 100% sure about the Najasat of a place you must avoid if you are sure about food that it is cooked by non Muslim( chines or Hindus). You must not eat nor should you buy 'halal animal’s meat' from departmental stores unless you are sure that it is slaughtered according to Islamic Shariya. But I think Malaysia must be different from Singapur and Hong Kong.