Perhaps you should try some spelling variations:
"survey first international airports." » "survey first international airport.", "survey first international transport.", "survey first international airshow.", "survey 1st international airports.", "survey report international airports.", "survey bias international airports.", "survey cost international airports."
"slopes measuring national efforts." » "roper measuring national efforts.", "scales measuring national efforts.", "schools measuring national efforts.", "slopes measuring national export."

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