Perhaps you should try some spelling variations:
"central city research project case." » "central society research project case.", "central equity research project case.", "central cgiar research project case.", "central cities research project case.", "central city research projects case.", "central city research project based.", "central city research project cycle."
"central asia research project risk." » "central basic research project risk.", "central cgiar research project risk.", "central a research project risk."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("central city research project case.") or ("central asia research project risk."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central city research project case.") OR ("central asia research project risk."))*.
• Removing quotes may allow a broader search: (( central city research project case. ) or ( central asia research project risk. ))*.