[quote=zk]I don’t really think there are any.[/quote]
There are 2. City Heights and Mira Mesa. Linda Vista has some too.
[quote=zk]I read somewhere that Vietnamese has 56 different vowel sounds.[/quote]
There are 11 vowels and 5 accents. So, if you count the accents and how they change the sound of the vowels, then that’s correct.