One hundred and twenty-six participants were randomly selected and participated into this study during January to March 2011.The data collection was performed at the Cardiology-Rheumatology Unit, Thai Nguyen General Hospital, Vietnam by using the Demographic and Clinical Data Form, The Dutch Heart Failure Knowledge Scale (DHFKS), the European Heart
Failure Self-care Behaviors Scale-9 (EHFScBS-9), and the Multidimensional Scale Perceived Social Support (MSPSS). The reliabilities of DHFKS, EHFScBS-9, and MSPSS were .72, .73, and .74, respectively. Percentage, mean, standard deviation,
the Spearman’s Rho and Pearson Product Moment Correlation Coefficient were employed to analyze the data.