API Criteria &&

I am trying to view & update through the API. It states that I may use criteria. I can get it working fine provided there is only a single criteria required, however I am trying to do this with 2 & 3 crtieria that must be met prior to the activity being undertaken.

Specifically the API documentation states for multiple criteria - Example : (Name == "Jean" && DOB == "20-Jul-1981")

So I have built this into the JSON array I send. It appears to be reading it and trying to act upon it but is returning me an error even though there are rows that meet this criteria.

"criteria":"cf_booking_id=QGPR-291114 && cf_items_id=4 && cf_items_current=true","status":"Failure, No Records Found With Specified Criteria."

What am I doing wrong? The examples all only show a single criteria.
Thanks