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 sides banking series." » "supply sides banking services.", "supply sides banking service.", "supply sides banking crises.", "supply codes banking series.", "supply sme banking series.", "supply time banking series.", "supply side banking series."

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

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