When you put "index of" in quotes, you are forcing Google to look for those exact words in that specific order. Web servers that have directory listing enabled often display a default page titled “Index of /folder-name/”. The phrase “Index of” is a universal marker for an open directory.

intitle:"index of" coreldraw lifestyle -shutterstock -adobe

Google has begun hiding many open directories. Use these alternatives:

To narrow results even further, combine operators: