Perhaps you should try some spelling variations:
reporting based » reporting basic, reporting basics, report based
reporting bias » reporting biases, reporting bugs, reporting base
reporting bis » reporting bugs, reporting b, reporting bei

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: "((((reporting bias) OR (reporting bis))) OR (reporting based)).
• Removing quotes may allow a broader search: ((((reporting bias) or (reporting bis))) or (reporting based)).
• Adding a wildcard symbol may retrieve word variants: "((((reporting bias) or (reporting bis))) or (reporting based))*.