Tiếng Việt nam has so many dialects which differs from each other. I have a Southern dialect of Saigon/Vung Tau and the sounding of words are different compared to middle Hue or northern Ha Noi and words can be changed for others depending on where your from.
Which dialect do you have?

I'm Livonian, so I don't know what Vietnamese dialect I speak...

I have the best of both worlds, both my parents are half north and half south. My dialect is mainly north though.