Why Chiang mai ,chiang rai many people said chieng mai,chieng rai

pattaya some people said padhya ?

Ayutthaya most people said Ayudhya?

Thai have a many Regional accents ?

and how to say mosque , muslims,Quran, buddhist sutra in thai ?

why many thai audience watch the muay thai shout oi and dteh ? what that mean?

All major languages have accents. Why? Because people stick together in groups, have a desire to distinguish between 'us and them' and each group to some extent comes to favour and invent speech features of its own. It happens everywhere, in every culture. In no country does everyone sound exactly the same. This effect combined with geographical spreading and territorial ideas first give rise to accents and eventually give rise to what is classified as languages. The exact difference between a language and a dialect is basically political, because there are languages that are mutually intelligible, but accents that are not. (Simplified reasoning, but those are the basic mechanisms). Thailand is usually divided into four larger dialects - Northern Thai, Northeastern Thai, Central Thai, Southern Thai. Within each of these dialect groups, there are further differences. If you want to know the subject in depth, William Smalley's 'Linguistic Diversity and National Unity: Language Ecology in Thailand' is a fantastic read. mosque - มัสยิด (mat-sa-yid) muslims - มุสลิม (mu-sa-lim) or, as an explanation ผู้ถือศาสนาอิสลาม (poo thue sat-sa-naa it-sa-laam) Quran - กุรอาน (gu-raan) or อัลกุรอาน (an gu-raan) Buddhist sutra - พระสูตรพุทธศาสนา (pra-suut puta sat-sa-naa)