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 bias integration south." » "export bias integration study.", "export bias integration some.", "export bias integration through.", "export asian integration south.", "export firms integration south.", "export can integration south.", "export base 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 bias integration south.") or ("import policy interventions series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("export bias integration south.") OR ("import policy interventions series."))*.
• Removing quotes may allow a broader search: (( export bias integration south. ) or ( import policy interventions series. ))*.