Translation of Dreieck

Mr. Chang informed me that you have a customer that requires similar applications to what my customers have here in Switzerland. I am planning my next trip and I will consider visiting you too.
He advised against traveling in this region at night as they were many violent robberies and one should return before dusk. He told me that he himself got robbed about two months earlier just here.
On the way we visited many small hill tribe villages. The walk was through green, wet rice fields. We really enjoyed it. Our guide explained us about the region and taught us some Vietnamese.