If you use the site search and get 0 results, you're presented with a handy link to re-try your search with Google:
Alternately, try your search in Google:
If you use any operators, this link isn't shown, presumably because Google can't really do things like
However, the body: and title: operators are somehow not accounted for, and the link is still shown if they're used. This makes the link somewhat less useful because:
Google plain doesn't understand body: and counts it as a search term.
Google does understand title:, but not as you'd expect. It's not valid for web searches, so the search terms will simply be dropped.
This could be fixed by suppressing the Google link if these operators are used, or simply rewriting them to their rough Google equivalents: