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 grid integration social." » "support grid international social.", "support trade integration social.", "support _ integration social.", "support agri integration social.", "support grant integration social.", "support group integration social."

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

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