Perhaps you should try some spelling variations:
"support a integration theories." » "support a integration theorems.", "support a integrationstheorie 2.", "support a integration theory.", "support 3 integration theories.", "support 2 integration theories.", "support 4 integration theories.", "support _ integration theories."
"import dat_ integration schemes." » "import dat_ integration schengen.", "import dat_ irrigation schemes.", "import dat_ integration regimes.", "import data integration schemes.", "import dutch integration schemes.", "import _ integration schemes.", "import duty integration schemes.", "import dutie 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: (("import dat_ integration schemes.") OR ("support a integration theories."))~.
• Removing quotes may allow a broader search: (( import dat_ integration schemes. ) or ( support a integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("import dat_ integration schemes.") or ("support a integration theories."))*.