Perhaps you should try some spelling variations:
"support trade integration theories." » "support trade integration theorems.", "support trade integrationstheorie 2.", "support trade integration theory.", "support trainer integration theories.", "export trade integration theories.", "import trade integration theories."
"support carbon integration schemes." » "support carbon integration schengen.", "support carbon irrigation schemes.", "support carbon integration regimes.", "support carlo integration schemes.", "support urban integration schemes.", "support can integration schemes.", "supporting carbon integration schemes.", "support common integration schemes."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support carbon integration schemes.") or ("support trade integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support carbon integration schemes.") OR ("support trade integration theories.")).
• Removing quotes may allow a broader search: (( support carbon integration schemes. ) or ( support trade integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("support carbon integration schemes.") or ("support trade integration theories."))*.