Perhaps you should try some spelling variations:
"export day integration theories." » "export day integration theorems.", "export day integrationstheorie 2.", "export day integration theory.", "export data integration theories.", "export die integration theories.", "export der integration theories."
"support grid integration schemes." » "support grid integration schengen.", "support grid irrigation schemes.", "support grid integration regimes.", "support agri integration schemes.", "support grant integration schemes.", "support group integration schemes."

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 grid integration schemes.") OR ("export day integration theories."))~.
• Removing quotes may allow a broader search: (( support grid integration schemes. ) or ( export day integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grid integration schemes.") or ("export day integration theories."))*.