Inclusion Criteria:  Being the primary caregivers of patients with dementia for at least the past 6 months and will continue to be for the next 6 months of the intervention. Dementia patients are those who have been diagnosed with dementia for at least 6 months and are living in the community. Being able to read and understand Vietnamese (at least primary education), and willing to participate in the study. Having a smartphone that has the Zalo app or willing to have this Zalo app be installed (there will be short training of using Zalo for new users)  Exclusion Criteria:  Having any acute diseases or cognitive impairment (screening by Mini-Cog), Having vision or hearing impairment