Those of SE Asia use the Indian Script of the Quran and thats why they say zhal, azeem, kuasar, etc..
Just to clarify- to recite the Qur'aan in the above manner is wrong. It changes the meaning of the Qur'aan.
It is very important that one learns basic tajweed at the least so as to not make mistakes. It is sad to see that people recite Soorah al-Faatihah (for all their lives) and make major mistakes. I remember when I was back home when I prayed behind some people- I had to repeat my salaah due to the mistakes they made in their Soorah al-Faatihah. Remember, without soorah al-Faatihah the Salaah is not even valid (obviously we give the ignorant people the excuse of ignorance).
The Makhaarij (as to where each letter orginates from, when recited) is the same in every single riwaayah of the Qur'aan, even though there are 7 different ways to recite it.
The Asian way (commonly recited back home) is far away from being correct and has some major mistakes in it- which even change the meaning of the ayaat. I am not talking about tilaawah here, rather just the makhaarij of the letters of the Qur'aan and not the tune they recite it in.