The family of missing Nora Quoirin have offered a reward of around €10,800 for information leading to the return of the teenager.
More than 300 search and rescue personnel have been involved in the hunt for 15-year-old Nora, who was travelling on an Irish passport when she disappeared from a Malaysian jungle resort on Sunday August 4.
The reward of 50,000 Malaysian ringgit - approximately €10,806 - was donated by an anonymous Belfast business, Nora's family said.
Her aunt set up an online fundraising page in the aftermath of her disappearance, which has so far collected more than £90,000 (€97,256).
A second campaign created by Nora's uncle to collect money in euros now totals more than €15,000.
In a statement on Monday, Nora's family said: "Nora is our first child. She has been vulnerable since the day she was born.
"She is so precious to us and our hearts are breaking. We are appealing to anyone who has information about Nora to help us find her.
"The police have been working extremely hard to bring Nora home. In order to help their investigation, we have decided to offer a reward: 50,000R has been donated by an anonymous Belfast-based business for any information that directly helps us to find Nora.
"If you have any information at all, please call the police hotline here on 01112285058 or email email@example.com from outside Malaysia."
On Monday morning, a total of 348 personnel were deployed in the search operation, the largest team so far, according to Malaysia's Malay Mail newspaper.
Malaysian police set up a new hotline over the weekend, while voluntary hikers also joined the search for Nora, who was born with the brain defect holoprosencephaly and has special needs.
The Associated Press reported that a Malaysian shaman has joined in the search, adding that police released a video showing a shaman wearing a white skullcap performing rituals in the forest.
Nora's parents, Meabh and Sebastien Quoirin, a French-Irish couple who have lived in London for 20 years, thanked those involved in looking for her.
"You have given up your time especially at a special festival time," said Ms Quoirin, referring to Hari Raya Haji, the Islamic "festival of sacrifice" celebrations.
In a video broadcast on local media, she added: "We want to say thank you to each and every one of you. We know you're searching night and day for Nora.
"We see you working so hard and also praying with us and being with us."
The family have said they remain hopeful after police leading the investigation refused to rule out a "criminal element".
The National Crime Agency (NCA), members of An Garda Síochána and the Metropolitan Police are supporting the Malaysian police with the case.
A spokeswoman for the NCA said: "The National Crime Agency, the Met Police and the Irish police are working together to help and support the Malaysian authorities relating to Nora Quoirin's disappearance."
Anyone with information is asked to contact the Lucie Blackman Trust intelligence on firstname.lastname@example.org or +44 800 098 8485.
Who'd be a parent? Take last week. Fifteen-year-old Mikey Leddy from Navan died after he fell from a wall in Puerto Del Carmen in Lanzarote. The 15-year-old was on holiday with his mum and dad, Aisling and Damien. Family holidays are magical times, when families reset and bond and get to know each other again. And then suddenly, in a split second everything changes forever and lives are ruined.