We need to see the entire list of zero search terms. If we filter for a week, and then a month... max results is pegged at 10.
Secondly, if a search term was used twice in a period of time, then it shows up twice in the report. Which doesn't make sense.
Third, when we search for the term that didn't get any results, then it is again repeated as a zero search term in the next week's report.