Okay, but it would have been helpful if you had mentioned that in the first place.
The only reference I can find is Taylor. It grows in southern Vietnam, perhaps adjacent Cambodia and Thailand. Most specimens recorded are from Thi Tinh, a hill about 70 km NW of Saigon. The rest of the data is similarly vague. Altitude is given as 1500m, recorded in flower march, june and december.
It has a twining inflorescence wih yellow flowers 1-1.7 cm long.
I does not seem likely that you would be able to find it, although if you did, make sure you record the details and preserve a specimen - there would likely be people interested in seeing it.
Good luck.