The fourth wave of the COVID-19 epidemic erupted in many localities across Vietnam, resulting in a surge in infections, hospitalizations, and deaths, making the government's response efforts appear ineffective. It has overshadowed the Vietnamese government's previous accomplishments and reduced public trust in its capacity to cope with the COVID-19 pandemic. This fact has received special attention from many scientists. Therefore, this study investigates the factors influencing Vietnamese mature people's beliefs about the government's success in controlling the COVID-19 pandemic to supplement the evidence of previous studies, enrich the literature review, and make policy recommendations to the Government of Vietnam. This study was conducted through a cross-sectional survey using an intentional sampling technique (n=200). Multivariate linear regression analysis techniques and moderator regression were applied to prove the proposed hypotheses. Its research findings have indicated that the factors of anxiety, fear, and awareness have a positive and significant impact on adult Vietnamese's belief in the Vietnamese government's capacity to control the COVID-19 pandemic at various levels. Their understanding of COVID-19, in particular, moderates the relationship between anxiety and fear.
