/ˈɛfɪkəsi/ – noun
Definition: sự có hiệu quả, sự có hiệu nghiệm, sự có công hiệu, sự có tác dụng.
A more thorough explanation: Efficacy refers to the ability of something, such as a drug or treatment, to produce the desired effect or result under ideal and controlled conditions, typically demonstrated in clinical trials or scientific studies. It is a measure of how well a particular intervention works in achieving its intended purpose.
Example: The efficacy of the new drug in treating the patients’ symptoms was demonstrated in the clinical trial.