Perhaps you should try some spelling variations:
"supply based international airports." » "supply based international airport.", "supply based international transport.", "supply based international airshow.", "supply land international airports.", "supply 2nd international airports.", "supply 3rd international airports.", "supply case international airports.", "supplies based international airports.", "supply asia international airports."
"supply sites conservation efforts." » "supply situ conservation efforts.", "supply species conservation efforts.", "supply forest conservation efforts.", "supply sides conservation efforts.", "supply siders conservation efforts.", "supply side conservation efforts."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply based international airports.") or ("supply sites conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply based international airports.") OR ("supply sites conservation efforts.")).
• Removing quotes may allow a broader search: (( supply based international airports. ) or ( supply sites conservation efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("supply based international airports.") or ("supply sites conservation efforts."))*.