Thai people smile, the ถึว greeting and communicating with gestures that show came out with sincerity and happiness.By maybe don't say smile, nod, but if not it's answered smiling sometimes lose these manners.
Smiling for Thailand, Nos new greeting. And communicating with gestures Which is expressed with sincerity and joy by perhaps not to speak. He nodded to each other If you do not smile Sometimes it is bad manners at all.
A smile for Thai, meaning even if greeting, and communication with posture. Which will be expressed sincere and happy by maybe don't talk, smile nod to each other, but if not smile. Sometimes it's bad manners. .