Perhaps you should try some spelling variations:
"improving larval performance series." » "improving larval performance studies.", "improving larval performance size.", "improving level performance series.", "improving thermal performance series.", "improving maximal performance series.", "improving local performance series.", "improving legal performance series.", "improving land performance series."
"improving export performance review." » "improving export performance risk.", "improving export performance evidence.", "improving exposure performance review.", "improving eap performance review.", "improving eco performance review."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving larval performance series.") OR ("improving export performance review."))~.
• Removing quotes may allow a broader search: (( improving larval performance series. ) or ( improving export performance review. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving larval performance series.") or ("improving export performance review."))*.