This study explores the impact of AI-powered tools on teaching and learning academic writing skills in Vietnam. The research is conducted through action research, involving two language centers in Hanoi with 60 students and five teachers. The study focuses on the use of AI tools such as Grammarly and Quillbot to improve students' academic writing skills, particularly in coherence, cohesion, grammar, and vocabulary. **Key Findings:** - **Students' Weaknesses:** Before the intervention, students struggled with coherence, cohesion, sentence variety, and vocabulary. - **Post-Intervention Improvements:** After using AI tools for 10 weeks, students showed significant improvements in coherence, cohesion, and vocabulary. Grammatical range and accuracy also improved, though less notably. - **Statistical Significance:** A paired-sample t-test confirmed that the post-test scores were significantly higher than the pre-test scores, indicating a positive impact of AI tools. - **Frequency of Use:** A one-way ANOVA test revealed a statistically significant relationship between the frequency of AI tool usage and improvement in writing skills, suggesting that more frequent use leads to better results. **Discussion:** The study supports the positive impact of AI tools on academic writing skills, aligning with previous research on the transformative effects of technology in language education. However, it also highlights the need for further research to address potential negative effects, such as over-reliance on technology and potential loss of creative thinking skills. **Conclusion:** AI-powered tools have a promising effect on improving students' academic writing skills, particularly in coherence, cohesion, and vocabulary. Further research is recommended to explore the broader implications of AI in language education.This study explores the impact of AI-powered tools on teaching and learning academic writing skills in Vietnam. The research is conducted through action research, involving two language centers in Hanoi with 60 students and five teachers. The study focuses on the use of AI tools such as Grammarly and Quillbot to improve students' academic writing skills, particularly in coherence, cohesion, grammar, and vocabulary. **Key Findings:** - **Students' Weaknesses:** Before the intervention, students struggled with coherence, cohesion, sentence variety, and vocabulary. - **Post-Intervention Improvements:** After using AI tools for 10 weeks, students showed significant improvements in coherence, cohesion, and vocabulary. Grammatical range and accuracy also improved, though less notably. - **Statistical Significance:** A paired-sample t-test confirmed that the post-test scores were significantly higher than the pre-test scores, indicating a positive impact of AI tools. - **Frequency of Use:** A one-way ANOVA test revealed a statistically significant relationship between the frequency of AI tool usage and improvement in writing skills, suggesting that more frequent use leads to better results. **Discussion:** The study supports the positive impact of AI tools on academic writing skills, aligning with previous research on the transformative effects of technology in language education. However, it also highlights the need for further research to address potential negative effects, such as over-reliance on technology and potential loss of creative thinking skills. **Conclusion:** AI-powered tools have a promising effect on improving students' academic writing skills, particularly in coherence, cohesion, and vocabulary. Further research is recommended to explore the broader implications of AI in language education.