As a Malaysian.. I am ashamed...
Malay is our national language, but we used to be a British colony, so that's why English is just as popular.
Basically the three main races here are Malay, Chinese and Indian, with English and the Malay Language being the Lingua Franca around here, just so we can stand at an international level. Still, a very large number of the population is still hilariously bad at English, I'm no expert, I make mistakes, but at least I dare say I make sense.
I don't watch DBZ, but I have no idea why we bothered even dubbing this in English, if we had to dub something, we would do so in Malay, our English is very wacky with tonnes of different accents mixed in. There are obviously better people to choose for an English dub.