Perhaps you should try some spelling variations:
"central taxes research firm surveys." » "central tables research firm surveys.", "central tax research firm surveys.", "central wages research firm surveys.", "central banks research firm surveys.", "federal taxes research firm surveys.", "central taxes research from surveys.", "central taxes research field surveys.", "central taxes research final surveys.", "central taxes research firm survey."
"central asi2 research areas series." » "central asia research areas series.", "central basic research areas series.", "central 2 research areas series.", "central asian research areas series.", "central asia's research areas series.", "central asi2 research areas services.", "central asi2 research ideas series.", "central asi2 research seas 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 asi2 research areas series.") or ("central taxes research firm surveys."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central asi2 research areas series.") OR ("central taxes research firm surveys.")).
• Removing quotes may allow a broader search: (( central asi2 research areas series. ) or ( central taxes research firm surveys. )).
• Adding a wildcard symbol may retrieve word variants: (("central asi2 research areas series.") or ("central taxes research firm surveys."))*.