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 conservation efforts." » "support plant conservation efforts.", "support grass conservation efforts.", "support plants conservation 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 conservation efforts."))~.
• Removing quotes may allow a broader search: (( support gvc integration theories. ) or ( support grant conservation efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support gvc integration theories.") or ("support grant conservation efforts."))*.