Perhaps you should try some spelling variations:
"support trade integration theories." » "support trade integration theory.", "support trade integration through.", "support trade integration efforts.", "export trade integration theories.", "support grant integration theories.", "import trade integration theories."
"supply grid conservation efforts." » "supply aid conservation efforts.", "supply good conservation efforts.", "supply soil conservation efforts.", "supply crowd conservation efforts.", "support grid 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 theories.") OR ("supply grid conservation efforts."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"support trade integration theories.\") OR (\"supply grid conservation efforts.\"))".
• Removing quotes may allow a broader search: (( support trade integration theories. ) OR ( supply grid conservation efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("support trade integration theories.") OR ("supply grid conservation efforts."))*.