In card poker world, the terms “straight” and “flush” are commonly used to describe strong Hands. A “straight” refers to a player who has five adjacent cards, regardless of suit. On the other hand, a “flush” refers to five cards with the same suit, but not necessarily adjacent. “Flush or straight” is more common in games, the cards are always highly tactical Hands, in Vietnam, players pay attention to flush or straight to identify tactics. In some cases or use flush or straight as a duality, and players try to create appropriate strategies based on their circumstances. Understanding a “straight” and “flush” is the key to winning hands, especially when playing effective strategy or flush or straight. Vietnamese players are increasingly focusing on mastering these areas in poker.