Perhaps you should try some spelling variations:
"import policy interventions series." » "import policy interventions during.", "import policy intervention prices.", "import policy interventions helping.", "important policy interventions series.", "import price interventions series."
"export bans integration south." » "export bans integration study.", "export bans integration some.", "export bans integration through.", "export can integration south.", "export urban integration south.", "export data integration south.", "export base integration south.", "export bias integration south.", "import bans integration south."

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

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