Perhaps you should try some spelling variations:
"central s.asi_ research a series." » "central basic research a series.", "central asia research a series.", "central s.a research a series."
"central java research firm surveys." » "central data research firm surveys.", "central a research firm surveys.", "central iea research firm surveys.", "central java research from surveys.", "central java research field surveys.", "central java research final surveys.", "central japan research firm surveys.", "central bank research firm surveys.", "central asia research firm surveys.", "central java 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 s.asi_ research a series.") or ("central java research firm surveys."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central s.asi_ research a series.") OR ("central java research firm surveys."))*.
• Removing quotes may allow a broader search: (( central s.asi_ research a series. ) or ( central java research firm surveys. ))*.