Perhaps you should try some spelling variations:
"support trade integration theory." » "support trade integration through.", "support trade information theory.", "support trade innovation theory.", "support trainer integration theory.", "export trade integration theory.", "import trade integration theory."
"supply aid conservation efforts." » "supply land conservation efforts.", "supply bird conservation efforts.", "supply wild conservation efforts.", "supply asia conservation efforts.", "supply a conservation efforts.", "supply ann 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 trade integration theory.") or ("supply aid conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support trade integration theory.") OR ("supply aid conservation efforts.")).
• Removing quotes may allow a broader search: (( support trade integration theory. ) or ( supply aid conservation efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("support trade integration theory.") or ("supply aid conservation efforts."))*.