## Searching for brackets in Greek

I'm trying to find all the bracketed words (or letters John 20.31) in the Greek New Testament.
I should be able to do it using the Graphical Search Engine, using the agreement box, and specifying required punctuation.
The punctuation marks listed include:
; for Greek questions
, and . (comma and period)
raised dot (for Greek semicolon)
open/close parentheses
open/close brackets
- dash

I can successfully search for any of those punctuation marks EXCEPT for parentheses and brackets.
Any suggestions? Thanks.