Perhaps you should try some spelling variations:
"central asia research _ series." » "central basic research _ series.", "central media research _ series.", "central china research _ series."
"central de research fund survey." » "central de research funds survey.", "central de research funded survey.", "central de research funding survey.", "central e research fund survey.", "central dore research fund survey.", "central mode research fund survey.", "central de research field survey.", "central de research land surveys.", "central _ research fund survey.", "central body research fund 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 _ series.") or ("central de research fund survey."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central asia research _ series.") OR ("central de research fund survey."))*.
• Removing quotes may allow a broader search: (( central asia research _ series. ) or ( central de research fund survey. ))*.