Perhaps you should try some spelling variations:
"both numerical and experimental databases" » "both numerical and experimental database", "both numerical and experimental datasets", "both numerical and experimental analysis"
"both numerical and experimental dataset" » "both numerical and experimental datasets", "both numerical and experimental database"

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: (("both numerical and experimental dataset") OR ("both numerical and experimental databases"))~.
• Removing quotes may allow a broader search: (( both numerical and experimental dataset ) or ( both numerical and experimental databases ))~.
• Adding a wildcard symbol may retrieve word variants: (("both numerical and experimental dataset") or ("both numerical and experimental databases"))*.