Perhaps you should try some spelling variations:
"world bank regional and electoral studies" » "world bank regional and sectoral studies", "world bank regional and electrical studies", "world bank regional and doctoral studies", "world lanka regional and electoral studies", "world mask regional and electoral studies", "world park regional and electoral studies"
"world bank regional and spectral studies" » "world bank regional and structural studies", "world bank regional and sectional studies", "world bank regional and general studies", "world lanka regional and spectral studies", "world mask regional and spectral studies", "world park regional and spectral studies"
"world bank regional and sector studies" » "world bank regional and receptor studies", "world bank regional and sectional studies", "world lanka regional and sector studies", "world mask regional and sector studies", "world park regional and sector studies"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("world bank regional and sector studies") OR ((("world bank regional and electoral studies") OR ("world bank regional and spectral studies")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world bank regional and sector studies\") or (((\"world bank regional and electoral studies\") OR (\"world bank regional and spectral studies\"))))".
• Removing quotes may allow a broader search: (( world bank regional and sector studies ) or ((( world bank regional and electoral studies ) OR ( world bank regional and spectral studies )))).
• Adding a wildcard symbol may retrieve word variants: (("world bank regional and sector studies") or ((("world bank regional and electoral studies") OR ("world bank regional and spectral studies"))))*.