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."
"supply factors integration series." » "supply factor integration series.", "supply facto integration series.", "supply sector integration series.", "supply factors integrating services.", "supply factors integration schemes.", "supply factors integration social.", "supply functions integration series."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("import data integration theories.") or ("supply factors integration series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import data integration theories.") OR ("supply factors integration series."))*.
• Removing quotes may allow a broader search: (( import data integration theories. ) or ( supply factors integration series. ))*.