advanced search not working on forum

‘advanced search’ not working any more on forum website.
( )
i think, we lost this function since website update…
‘Google custom search’ is not an option for me.
would be fine see it working -thanks.

OK, I found a workaround by creating a search string and pasting it into the URL locator:
search word a AND b
search word a OR b

Anyway, ‘advanced search’ on forum would be very usefull when it works again.
Who is responsible for the functionality of the website?
Thanks. j.