Discovering the Indochina, you can start the travel from Kuala Lumpur (malaysia) (3 days to visit this city) and going up with train to phuket (thailand) (stop 5 days, visit also phiphi islands). Then you can keep the fly (air asia, orient thai or bkk air) to Bangkok. Next if you not have already the visas, go to burma embassy and keep 1 turistic visa (60 usd) and wait 2 days for to have this visa. Meanwhile visit Bangkok. Next, keep the fly to Yangoon (burma) and discover this city and the place near (stop 5 days). Next, return to bkk and keep fly directly to ponh Penh (cambodia) you make the visa at the immigration airport (60 usd). Into cambodia look the capital and go with the boat to siam reap (totally 5 days). From siam reap, keep the fly and go to vientiane (laos) and visit the capital and the place near (4 days). In laos have visa run as Thailand. Then, return to thailand with fly.
The Indochina travel is finished!
Total days: from 25 to 30