Perhaps you should try some spelling variations:
"import data integration theories." » "import data integration theory.", "import data integration through.", "import data integration efforts.", "import trade integration theories.", "import _ integration theories.", "import data integrity theories.", "import duty integration theories."
"support grant integrating services." » "support grant integrated services.", "support grant testing services.", "support grant integrating policies.", "support gaps integrating services.", "support count integrating services.", "support migrant integration services."

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