Perhaps you should try some spelling variations:
"central a research final surveys." » "central a research finance surveys.", "central a research field surveys.", "central a research funds surveys.", "central a research firm surveys.", "central a research panel surveys.", "central 2 research final surveys.", "central la research final surveys.", "central _ research final surveys.", "central 1 research final surveys."
"central _sia research a series." » "central asia research a series.", "central fia research a series.", "central sla research a series.", "central asian research a series.", "central asia's research a series.", "central _si2 research a 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: (("central _sia research a series.") or ("central a research final surveys."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central _sia research a series.") OR ("central a research final surveys.")).
• Removing quotes may allow a broader search: (( central _sia research a series. ) or ( central a research final surveys. )).
• Adding a wildcard symbol may retrieve word variants: (("central _sia research a series.") or ("central a research final surveys."))*.