Retired nurse Nga put her life savings into a bond at Vietnam's SCB bank, but now cannot access her money after being caught up with tens of thousands in a multibillion-dollar scam that has shocked the nation.I put my whole life savings there," said the 67-year-old Hanoi resident, showing AFP the bond certificates worth around $120,000 issued by SCB. "I planned to use the money to maintain our house... to help my kids."