need advice for traveling to vietnam,Cambodia and Macau

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Hi all.. I have plan to go to vietnam and Cambodia andf then from those country will go to Macau with my friend next year on march but we dont know the situation and what good spots there so anyone ever visited vietnam , Cambodia and Macau before? please give me some tips, how the situation there and what good spots to visit there and of course cheap hostels or hotels. thanx for your all your advices, that will be much usefull to us..