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The offical website for the Vietnamese embassy in Canada is: http://www.vietem-ca.com/
This is from a list of Vietnamese diplomatic missions abroad provided by the Vietnamese government here (Although my experience of Vietnam and the Internet would not give me complete faith in it being kept up to date). The website with the lists was linked to as an offical Vietnamese government page via the Australian SmartTraveller page. It's also linked to from the website of the Vietnamese embassy in the UK.
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This is the link of the Vietnamite Embassy in Canada
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The whois of vietem-ca: http://whois.domaintools.com/vietem-ca.com
The whois of vietnamembassy-canada.ca: http://whois.domaintools.com/vietnamembassy-canada.ca
They both say Wilbroad as the street, have the same postal code and are both in Ottawa.
One possibility: the embassy website was hosted by one of their tech guys and then when he left and another was onboard they just got another domain for it. At which point both would kinda be valid, but at differing points in time.