The first and second pictures it could be either Luisia filiformis or Luisia secunda but according to IOSPE Lsa. filiformis flower size is 5mm while Lsa. secunda is 4cm. The third picture looks more like Lsa. brachystachys instead of Lsa. thailandica except the whole flower is yellow. You can check IOSPE website for reference.

All of them are cute regardless. Do they have any scent? Hope that I could acquired orchid from this genus someday.