I love to travel but haven't been to Indochina. There is an organizaiton, AbleData that is funded through the US Department of Education that has a wide variety of travel resources listed. You might check them out -
http://www.abledata.com/abledata.cfm?pageid=113573&top=16052
They list a group - EasyAsia - that looks very thorough in their travel assistance. Since I have not worked with this agency, please be sure to check them out on your own- maybe look for some online reviews about their travel help.
http://www.easyasia.info/
I am so glad to know there are people who don't let their MS stop them from seeing the world. best, Laura