Bạn tham khảo ở đây nha https://diendan.hocmai.vn/threads/lap-dan-y-thuyet-minh-ve-cai-keo-va-cai-but-hai-bai-rieng-nha-thanks.254783/
https://diendan.hocmai.vn/threads/van-9-thuyet-minh-ve-cai-quat.250216/
https://diendan.hocmai.vn/threads/van-9-thuyet-minh-ve-chiec-non-la.166552/