India's Rashid Khan and Adilson Da Silva of Brazil finished tied for third, a further two shots back, but were unable to catch Chia, who birdied three of his first five holes to snatch the lead and held on to win despite making four bogeys on the back nine.
Chia's only previous Asian Tour victory was at the 2002 Taiwan Open and his latest success comes a year he returned to golf following surgery to repair a compressed nerve problem that was paralysing his left arm.
"It’s been only 13 years," he said. "I felt really touched when I sank that winning putt but now, I am overwhelmed with joy.
"It’s been one year since my return and I am very pleased to win on the Asian Tour again. I didn’t have much confidence with this golf course so I didn’t expect to win."
(Reporting by Julian Linden in Singapore; editing by Amlan Chakraborty)
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