Perhaps you should try some spelling variations:
"central asia research team series." » "central basic research team series.", "central media research team series.", "central china research team series.", "central asia research stem series.", "central asia research nejm series.", "central asia research tilsm series."
"central tax research firm survey." » "central tax research from survey.", "central tax research field survey.", "central tax research final survey.", "central 2 research firm survey.", "central 2.1 research firm survey.", "central 2.2 research firm survey.", "central taxes research firm survey.", "central bank research firm survey."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("central asia research team series.") or ("central tax research firm survey."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central asia research team series.") OR ("central tax research firm survey.")).
• Removing quotes may allow a broader search: (( central asia research team series. ) or ( central tax research firm survey. )).
• Adding a wildcard symbol may retrieve word variants: (("central asia research team series.") or ("central tax research firm survey."))*.