Perhaps you should try some spelling variations:
"central cgiar research forum series." » "central climate research forum series.", "central cgiar research focus series.", "central cgiar research firm series.", "central cgiar research program series.", "central asia research forum series.", "central asian research forum series."
"central city research forum series." » "central city research focus series.", "central city research firm series.", "central city research program series.", "central society research forum series.", "central equity research forum series.", "central rice research forum series.", "central cities research forum series."

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