Perhaps you should try some spelling variations:
"supply curve integration theories." » "supply curve integration theorems.", "supply curve integrationstheorie 2.", "supply curve integration theory.", "supply care integration theories.", "supply burke integration theories.", "supply curvello integration theories."
"supply marine conservation efforts." » "supply nature conservation efforts.", "supply land conservation efforts.", "supply heritage conservation efforts.", "supply main conservation efforts.", "supply ukraine conservation efforts.", "supply market 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 curve integration theories.") or ("supply marine conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply curve integration theories.") OR ("supply marine conservation efforts.")).
• Removing quotes may allow a broader search: (( supply curve integration theories. ) or ( supply marine conservation efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("supply curve integration theories.") or ("supply marine conservation efforts."))*.