Perhaps you should try some spelling variations:
"support agri integration theories." » "support agri integration theorems.", "support agri integrationstheorie 2.", "support agri integration theory.", "support grid integration theories.", "support der integration theories.", "support iii integration theories.", "support aging integration theories.", "support a integration theories."
"import trade integration schemes." » "import trade integration schengen.", "import trade irrigation schemes.", "import trade integration regimes.", "export trade integration schemes.", "import price integration schemes.", "import taxes 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 agri integration theories.") or ("import trade integration schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support agri integration theories.") OR ("import trade integration schemes."))*.
• Removing quotes may allow a broader search: (( support agri integration theories. ) or ( import trade integration schemes. ))*.