Perhaps you should try some spelling variations:
"protective effects reports" » "protective effect reports", "protective effects report", "protective effects repousse", "protective defect reports"
"collective effect reports" » "collective effects reports", "convective effects reports", "collective expert reports", "collective defect reports", "collective effects report", "collective affect reported"

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: (("collective effect reports") OR ("protective effects reports"))*.
• Removing quotes may allow a broader search: (( collective effect reports ) or ( protective effects reports ))*.