Perhaps you should try some spelling variations:
"importing country performance series." » "importing country performance studies.", "importing country performance size.", "important country performance series.", "reporting country performance series.", "exporting country performance series."
"improving sector performance series." » "improving sector performance studies.", "improving sector performance size.", "improve sector performance series.", "improving eco performance series.", "improving sewer performance series."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("importing country performance series.") or ("improving sector performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("importing country performance series.") OR ("improving sector performance series.")).
• Removing quotes may allow a broader search: (( importing country performance series. ) or ( improving sector performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("importing country performance series.") or ("improving sector performance series."))*.