Perhaps you should try some spelling variations:
"support gvc integration theories." » "support gvc integration theorems.", "support gvc integrationstheorie 2.", "support gvc integration theory.", "support c integration theories.", "support die integration theories.", "support der integration theories.", "support g integration theories.", "support agri integration theories.", "support grid integration theories."
"support grant integration efforts." » "support grant international efforts.", "support grant conservation efforts.", "support migrant integration efforts.", "support migrants integration efforts.", "support statt integration efforts."

You may be able to get more results by adjusting your search query.

• 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. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support gvc integration theories.") or ("support grant integration efforts."))*.