Perhaps you should try some spelling variations:
"support stable international airports." » "support stable international airport.", "support stable international transport.", "support stable international airshow.", "support scale international airports.", "support state international airports.", "support states international airports.", "support stage international airports.", "supporting stable international airports."
"support bird conservation efforts." » "support land conservation efforts.", "support situ conservation efforts.", "support fuel conservation efforts.", "support build conservation efforts.", "support big conservation efforts.", "support add conservation efforts."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support bird conservation efforts.") OR ("support stable international airports."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"support bird conservation efforts.\") OR (\"support stable international airports.\"))".
• Removing quotes may allow a broader search: (( support bird conservation efforts. ) OR ( support stable international airports. )).
• Adding a wildcard symbol may retrieve word variants: (("support bird conservation efforts.") OR ("support stable international airports."))*.