Perhaps you should try some spelling variations:
"support gvc integration theories." » "support gvc integration theory.", "support gvc integration through.", "support gvc integration reforms.", "support grid integration theories.", "support _ integration theories.", "support eu integration theories.", "support ndc integration theories.", "support agri integration theories."
"support grant integration efforts." » "support grant international efforts.", "support grant conservation efforts.", "support migrant integration efforts.", "support trade integration efforts.", "support grid integration 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 gvc integration theories.") or ("support grant integration efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support gvc integration theories.") OR ("support grant integration efforts."))*.
• Removing quotes may allow a broader search: (( support gvc integration theories. ) or ( support grant integration efforts. ))*.