Perhaps you should try some spelling variations:
"global environment performance contracts." » "global environmental performance contracts.", "global environmental performances contracts.", "global investment performance contracts."
"global government performance series." » "global environmental performance series.", "global government performance studies.", "global government performance size.", "local government performance series.", "local governments performance series.", "total government performance series."

Try widening your search to All Fields.

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

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