Perhaps you should try some spelling variations:
"central asia research _ series." » "central basic research _ series.", "central cgiar research _ series.", "central a research _ series."
"central de research team surveys." » "central de research areas surveys.", "central de research a surveys.", "central de research firm surveys.", "central de research from surveys.", "central does research team surveys.", "central key research team surveys.", "central led research team surveys.", "centrale des research team surveys.", "central _ research team surveys.", "centro de research team surveys."

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 team surveys."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central asia research _ series.") OR ("central de research team surveys."))*.
• Removing quotes may allow a broader search: (( central asia research _ series. ) or ( central de research team surveys. ))*.