Perhaps you should try some spelling variations:
"central asia research firm surveys." » "central basic research firm surveys.", "central media research firm surveys.", "central china research firm surveys.", "central asia research from surveys.", "central asia research field surveys.", "central asia research final surveys.", "central asia research firm survey."
"Central Asia research team series." » "Central Asia research stem series.", "Central Asia research nejm series.", "Central Asia research tilsm series."

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 asia research firm surveys."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Central Asia research team series.\") OR (\"central asia research firm surveys.\"))".
• Removing quotes may allow a broader search: (( Central Asia research team series. ) OR ( central asia research firm surveys. )).
• Adding a wildcard symbol may retrieve word variants: (("Central Asia research team series.") OR ("central asia research firm surveys."))*.