In conclusion, our study evaluated the performance of two LLMs, ChatGPT and BingChat, in answering chemistry questions in Vietnamese high school exams from 2019-2023. The results showed that both LLMs have limitations in answering questions at the application and high application levels, indicating their lack of ability to reason and apply knowledge. Moreover, when comparing the performance of ChatGPT and BingChat, BingChat generally outperformed ChatGPT in terms of accuracy. We also compared the performance of the LLMs with Vietnamese students' scores and found that both ChatGPT and BingChat have lower scores than the average score of Vietnamese students, indicating that LLMs have limitations in replacing human intelligence in the field of chemistry education. However, LLMs still have potential in providing assistance for students and teachers in learning and teaching activities, especially in providing instant feedback and personalized learning experiences. LLMs can also be used to generate questions and materials for practice and assessment. Additionally, LLMs can be improved by incorporating more domain-specific knowledge and enhancing their reasoning and application abilities. Overall, while LLMs show promise in the field of education, they still face challenges and limitations that need to be addressed. Future research can explore ways to improve LLMs' abilities to reason and apply knowledge, as well as investigate their effectiveness in improving student learning outcomes.