Perhaps you should try some spelling variations:
"central s.asi_ research team series." » "central basic research team series.", "central asia research team series.", "central s.a research team series.", "central s.asi_ research areas series.", "central s.asi_ research a series."
"central a research force survey." » "central a research focus survey.", "central a research firm survey.", "central a research food survey.", "central _ research force survey.", "central 2 research force survey.", "central tax research force survey.", "central s.a research force survey."

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 s.asi_ research team series.") or ("central a research force survey."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central s.asi_ research team series.") OR ("central a research force survey.")).
• Removing quotes may allow a broader search: (( central s.asi_ research team series. ) or ( central a research force survey. )).
• Adding a wildcard symbol may retrieve word variants: (("central s.asi_ research team series.") or ("central a research force survey."))*.