Dual Citizenship for Aussie

Hi all!

Iam a Viet kieu and looking for property investment in Vietnam. However, being Australian by national, the property tenure is only 50 years, which is quite sad... Now  I am seriously considering for vietnamese citizenship. 
Are there any Australian out there is currently holding a dual citizenship? Any problems, impediment in applying for it? What are the ups and downs of being vietnamese citizenship? Any precautions before applying?

Please kindly advise,

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