Attached is what the "help" document looks like.
Your script will find all records (pull up a found set) in the Help_Letters table where the Letter field will store the exact text "Department Definitions".
I don't know if any field in your screen shot is the "Letter" field or not. But check that field to see if it has the correct text and make sure that it does not have any additional text such as a space or a return character. Also, make sure that the field is defined as a text field and not a number field.
For examples of a better way to script the find process, see: Scripted Find Examples