Perhaps you should try some spelling variations:
"import datcan integration theories." » "import datcan integration theorems.", "import datcan integrationstheorie 2.", "import datcan integration series.", "import data integration theories.", "import asian integration theories.", "import asean integration theories."
"support a integration theory." » "support a integration through.", "support a information theory.", "support a innovation theory.", "support 3 integration theory.", "support 2 integration theory.", "support 4 integration theory.", "support _ integration theory."

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 datcan integration theories.") OR ("support a integration theory."))~.
• Removing quotes may allow a broader search: (( import datcan integration theories. ) or ( support a integration theory. ))~.
• Adding a wildcard symbol may retrieve word variants: (("import datcan integration theories.") or ("support a integration theory."))*.