Demonyms for people from a country name ended with a letter 'U'

Demonyms - The name used for the people who live in a particular state.
   [dem-uh-nim]

This is tricky,

Peru -  Peruvian
Palau -  Palauan
Nauru - Nauruan
Tuvalu - Tuvaluan

So,  what for Terengganu people?

Yes, you're right. It is Terengganuan.

A quote from a Chinese wise man

This advice has been quoted by Richard Carlson, Ph. D. in his book "What about the big stuff". The words of wisdom said by Seng-Ts'an are "Our way is not difficult, save the picking and choosing." It can be found on page 138 in 2002 version, published by HarperCollinsPublishers Australia