0% matching but we are certain there is copied content
I'm looking for some help, as we are relatively new to using Turnitin. A student has received a score of 0%, yet we are confident there is copied work. For example, one sentence refers to "research we conducted". I remember the Turnitin trainer talking about ways that students can try and circumvent the Turnitin checking process, but can't seem to find any information about this for instructors and administrators.
Can someone help me?