Students are no longer able to edit or delete their browsing history on their GCVS issued Chromebooks. It is now an accurate representation of where they are going (or attempting to go) on their Chromebook.
You can look up their history on their Chromebook, by opening Chrome and pushing the CTRL and H buttons at the same time, or clicking on the 3 stacked dots in the upper right corner of the browser and going down to History:
This will open up the history page that shows where you student has visited on their Chromebook. These are time stamped and organized by date. Clicking on these will take you to the page they visited.