Perhaps you should try some spelling variations:
"supply first international airports." » "supply first international airport.", "supply first international transport.", "supply first international airshow.", "supply from international airports.", "supply health international airports.", "supply cost international airports.", "survey first international airports.", "supply farm international airports."
"slopes measuring national efforts." » "schools measuring national efforts.", "cities measuring national efforts.", "slopes measuring national export.", "slopes measuring national forest."

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: (("slopes measuring national efforts.") OR ("supply first international airports."))~.
• Removing quotes may allow a broader search: (( slopes measuring national efforts. ) or ( supply first international airports. ))~.
• Adding a wildcard symbol may retrieve word variants: (("slopes measuring national efforts.") or ("supply first international airports."))*.