Perhaps you should try some spelling variations:
"improving air performance evidences." » "improving air performance evidence.", "improving air performance references.", "improving air performative evidence.", "improving zur performance evidences.", "improving bar performance evidences.", "improving der performance evidences.", "improving _ performance evidences."
"improving company performance review." » "improving country performance review.", "improving company performance risk.", "improving company performance evidence.", "improve company performance review.", "improving compliance performance review.", "improving community performance review."

Try widening your search to All Fields.

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