Perhaps you should try some spelling variations:
"support oil importing countries." » "support oil exporting countries.", "support oil importing country.", "support oil imports countries.", "support oil importers countries.", "support big importing countries.", "support our importing countries.", "support build importing countries."
"supply food conservation efforts." » "supply good conservation efforts.", "supply wood conservation efforts.", "supply from conservation efforts.", "supply cold conservation efforts.", "supply crowd 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: (("supply food conservation efforts.") or ("support oil importing countries."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply food conservation efforts.") OR ("support oil importing countries.")).
• Removing quotes may allow a broader search: (( supply food conservation efforts. ) or ( support oil importing countries. )).
• Adding a wildcard symbol may retrieve word variants: (("supply food conservation efforts.") or ("support oil importing countries."))*.