Perhaps you should try some spelling variations:
"improving court performance series." » "improving court performance studies.", "improving court performance size.", "improving export performance series.", "improving our performance series.", "improving your performance series.", "improving care performance series."
"borrowing country performance review." » "borrowing country performance risk.", "borrowing country performance evidence.", "borrowing countries performance review.", "borrowing costs performance review.", "borrowing cost performance review."

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving court performance series.\") OR (\"borrowing country performance review.\"))~".
• Removing quotes may allow a broader search: (( improving court performance series. ) OR ( borrowing country performance review. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving court performance series.") OR ("borrowing country performance review."))*.