commit 80153a86a549622dba040268994e8e5c06045ebe
Author: namnt_fpt <namnt@tromcho.net>
Date:   Wed Jul 8 10:10:17 2026 +0700

    upload sach

diff --git a/chuyenvoithanh.pdf b/chuyenvoithanh.pdf
new file mode 100644
index 0000000..e6b9446
Binary files /dev/null and b/chuyenvoithanh.pdf differ