Perhaps you should try some spelling variations:
"import duties integration series." » "import studies integration series.", "import dis integration series.", "import dutch integration series.", "import duties integration services.", "import duties integration server.", "import duties integration theories."
"import data interaction series." » "import data interactions series.", "import data interaction studies.", "import data interaction terms.", "import data integration series.", "import depth interaction series.", "import earth interaction series.", "import duty interaction 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 duties integration series.") or ("import data interaction series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import duties integration series.") OR ("import data interaction series.")).
• Removing quotes may allow a broader search: (( import duties integration series. ) or ( import data interaction series. )).
• Adding a wildcard symbol may retrieve word variants: (("import duties integration series.") or ("import data interaction series."))*.