Determining the existence of the relationship between overconfidence and investment decision in Vietnam. Determining the existence of the relationship between overconfidence and investment decision in Vietnam under the effect of the financial conditions. Determining the existence of the relationship between overconfidence 6 and funding decision in Vietnam. Determining the existence of the relationship between overconfidence and funding decision in Vietnam under the effect of a financial deficit. Determining the existence of the relationship between overconfidence and dividend decision in Vietnam. Determining the existence of the relationship between overconfidence and dividend decision in Vietnam under the effect of growth opportunity. | Doctoral thesis summary: Research on Ceo’s overconfident behavior and financial decisions in Vietnam companies