Found this trip organiser on forums/websites and thank to some very good reviews, my friend and I were looking to discover the Vietnamese's soul meanwhile going in such wonderful places: 100% success!
From the beginning, the agency's team was helpful & replied us very quickly. They organised us a very convenient 5-days-trip from Saigon (HCMC) to Phnom Penh by the Mekong Delta, their proper accommodation in Mekong Garden. We've been in such traditional places far away from all others tourists, at any moment we were forced to buy something. Our guide was nice, so experienced and a good both English & French speaker. He introduced us ethnical peoples, they were so friendly, generous, welcoming with us. Amazing :)
Well organised agency which knows how to satisfy their clients, recommend it. Thank you VOT & see you hopefully in few years!