Police say they are searching for three Mandarin-speaking women who are using stories about "evil spirits" to defraud members of Sydney's Chinese community.

In the latest incident, a 60-year-old woman handed over jewellery and cash in central Cabramatta last Thursday.

The con artists have told their victims that evil spirits will bring bad luck to their family unless they hand over money and other items.

Chief Inspector Arthur Aleksandrowicz says detectives are looking at similar incidents elsewhere in Sydney.

"Police believe that the scam has been developed to take advantage of the superstitious element within the Chinese community and particularly targeting the elderly," he said.

"Police are looking also at two similar incidents at Chatswood and Haymarket and they believe there are also likely to be other victims across Sydney who have not yet come forward."