How to batch modify HTML content in different books?
 

The conversion will make changes I don't want.
I found The Plugin which allows users specific subset of changes to be performed in isolation.However,there is no Search and Replace.
Can someone give me a plugin or tell me how to do it?

Your question is overly broad: Changes to HTML (and you want it done in bulk)
Are you trying to just fix:
CSS?
Spelling?
Metadata? (consider the builtin tools Like Polish or Embed Metadata)

If you DO USE 3rd part external tools, just remember to NOT change the filename and you can simply replace the current book file (what Open With does).

For example, I want to replace "Heelo" with "Hello" because there are some problems in my book,even more than one book.