The parents of Chinese woman Qi Yu, who was allegedly murdered by her housemate in Sydney, say they've barely slept since learning of their daughter's disappearance.
The 28-year-old's father, Zhihe Yu, and mother, Qing He, have visited bushland north of Sydney where police are searching for their daughter's body.
They then handed out missing person flyers at a press conference on Tuesday.
"Both of us cannot sleep ... my wife's tears run dry," Mr Yu said as his wife sobbed next to him.

The mother of missing women Qi Yu has pleaded for information to help find her daughter's body. Source: AAP

A flyer handed out by Qi Yu's parents in Sydney on Tuesday. Source: Twitter
"If you have any information regarding my daughter and her whereabouts please contact police."
Detective Superintendent Kerrie-Anne Lewis said the parents were "obviously distraught".
"They still have some element of hope but they are also very aware that it's been 18 days and the likelihood of finding their daughter alive is obviously non-existent," Supt Lewis told reporters.
Ms Yu was last seen by friends at a Campsie share house in the city's southwest on June 8.
Detectives believe she was taken by car to the Berowra area on the night she went missing. Her white Toyota Corolla was later found dumped in Burwood in the city's west.
A 19-year-old man was arrested and charged with her murder several days later.

In a raw and emotional press conference, Ms Yu's mother Qing He broke down as she handed out photos of her daughter. Source: SBS News

In a raw and emotional press conference, her mum Qing He broke down as she handed out photos of her daughter. Source: SBS Mandarin