Update chapters/ch33.md

Co-Authored-By: Phúc Lê <phuc.lkh@gmail.com>

chapters/ch33.md

@@ -1,6 +1,6 @@
 > # 33. Why we compare to human-level performance
 
-# 33. Tại cần so sánh chất lượng mức con người?
+# 33. Tại sao cần so sánh chất lượng mức con người?
 
 > Many machine learning systems aim to automate things that humans do well. Examples include image recognition, speech recognition, and email spam classification. Learning algorithms have also improved so much that we are now surpassing human-level performance on more and more of these tasks.