Sure, it follows much the same technique.
1. Create a list of keywords
Create a text file and put each keyword on a new line, e.g.
Note that the Expression type for the containing text field effects how the list will be converted into a search expression. For example, here's how the above keyword list is interpreted for specific expression types:
Boolean, Whole word, Boolean Regex
Legal OR (Accounts AND Department) OR London OR Customer
"Legal" OR "Accounts Department" OR "London" OR "Customer"
So, if you just want to search for the keywords exactly as they appear in the keyword list you should choose the expression type Plain Text.
2. Allow File Lists for the Containing Text field
By default File Lists are not enabled for the containing text field. You can activate the functionality in the Configuration -> Advanced -> File Lists Settings.
3. Point to the file in the Containing Text field
Finally you need to point to the keyword list and specify which files you are searching,