using " " quotation marks in search returns no results

If I do an exact string search in the cse I have built I get results, but if I do the exact string search in the plugin linked to that same search I get no results – if I remove the ” ” I get results but the search is then not for the precise word combination only

e.g. https://www.google.com:443/cse/publicurl?cx=007256160141272043299:vwzsnqyt3sy

vs http://search.museumsandtheweb.com/search

try searching for
Fedora, Drupal, and Cloud Computing for a low-cost, sustainable DAM

with and without ” “

thanks

http://wordpress.org/plugins/google-cse/