Dont' worry so much about the processing times guys. Back when I applied for my wife in 2014, a typical Vietnamese applicant would need about 1 year just to get to IN PROCESS for a non-complicated case, but my wife, along with numerous others at that time, were able to get our wives their PR in just 6 months average.
Then a year later, I was shocked to find that a few more applicants were able to get their Vietnamese spouses PR card in just THREE months for a non complicated case. You read that right, 3 months. If you guys scroll through the older posts of this forum, you should find a few of these people.
Also, I have a few people who were issued 24 month waiting period interview letters, but in reality, they only had to wait about a year on average, and one guy who just spoke with me last week, only had to wait 6 months for the interview.
And lastly, I know Vietnam has a bit of a bad rep for being difficult to get a visitor visa to Canada, especially if the Vietnamese spouse is married and sent in a PR app already, but my wife was successful in getting one (see signature and timeline). Don't be discouraged to apply for one if you feel you need to.
Keep your heads up and don't worry so much.