You can search for exact words or phrases as an exact string in the help system.
When you search in the help system, you can identify some words or phrases as an exact string by enclosing them in double quotation marks.
For example, when you input "log file" in the Search field instead of log file, you search for the string log file. Without the double quotation marks, the search term is interpreted to find instances of both the word log and the word file in the topics.