Perhaps you should try some spelling variations:
"borrowing country performance studies." » "borrowing country performance audits.", "borrowing country performance audit.", "borrowing country performance standards.", "borrowing countries performance studies.", "borrowing costs performance studies.", "borrowing cost performance studies."
"improving human performance review." » "improving human performance risk.", "improving human performance evidence.", "improving loan performance review.", "improving thermal performance review.", "improving chain performance review."

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

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