This research aims to investigating strategic management of social impact businesses in Vietnam during Covid-19 pandemic, when the government closed international borders and imposed a domestic lockdown as a result of the zero covid policy. The study is based on theoretical framework of strategic management and value chain analysis. The qualitative research approach was applied, which was based on a semi-structured questionnaire or guiding questions. The target population is Vietnamese social impact businesses with a diversity of demographic traits, genders of founders, product or service categories and economic sectors. Out of a total of 187 social enterprises invited to engage in the study via email, 15 businesses were chosen for in-depth interviews with management board. Finding reveals that the pandemic caused the problem of sluggish input materials because sources of goods imported from abroad or far-flung regions were congested or prohibited by the government. Besides, the curfew policies and closure of pandemic areas in the country have seriously affected the management and sale market of products. Therefore, most social impact enterprises deploy numerous new operation strategies to respond and adapt to the fluctuation of policy during the pandemic.