I already had Hep A, Hep B, Tyhoid and TDap on March 3rd before leaving the US
I'm not sure you can get a malaria vaccination, but when I travelled through Thailand/Cambodia/Laos my doctor prescribed malaria tablets which you take 2-3 times daily. A lot of SEA is prone to malaria so maybe check if you can get some while you are over there. almost 2 years ago
I would definitely recommend getting Malaria preventative medication as well as take some precautions re mosquito bites. Long sleeves, light colored clothing and not too much perfume.
Burn mozzie repellent at night and if your budget extends, get air conditioning.
The bigger issue is Dengue! almost 2 years ago