In poker games, having a clear understanding of poker hands rank is essential to ensure a high chance of winning. For players in Vietnam, they often have great attention to highest poker hands since they provide the most wins in a game. The poker hands rank from the lowest to highest include pair, two pairs, straight, flush, full house, quads, straight flush, royal flush, royal royal flush, and the highest is quads or straight flush. Playing poker in Vietnam, players need to know these highest poker hands to have a clearer mind about their cards and predict those from the others. In particular, understanding poker hands rank helps identify precisely these highest poker hands for maximum profits in poker games. Hence, investigating the poker hands rank system and corresponding highest poker hands is a fundamental step to excel in poker in Vietnam.