Perhaps you should try some spelling variations:
"support do international airshow." » "support 1 international airshow.", "support 10 international airshow.", "support 12 international airshow.", "support de international airshow.", "support does international airshow.", "support add international airshow."
"support forest conservation efforts." » "support fresh conservation efforts.", "support firms conservation efforts.", "support test conservation efforts.", "support forest construction efforts."

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"support forest conservation efforts.\") OR (\"support do international airshow.\"))~".
• Removing quotes may allow a broader search: (( support forest conservation efforts. ) OR ( support do international airshow. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support forest conservation efforts.") OR ("support do international airshow."))*.