Perhaps you should try some spelling variations:
"support grant integration theories." » "support grant integration theorems.", "support grant integrationstheorie 2.", "support grant integration theory.", "support migrant integration theories.", "support migrants integration theories.", "support statt integration theories."
"export trade integration schemes." » "export trade integration schengen.", "export trade irrigation schemes.", "export trade integration regimes.", "export taxes integration schemes.", "export base integration schemes.", "export tax 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 grant integration theories.") OR ("export trade integration schemes."))~.
• Removing quotes may allow a broader search: (( support grant integration theories. ) or ( export trade integration schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grant integration theories.") or ("export trade integration schemes."))*.