Perhaps you should try some spelling variations:
"World Bank regional and electrical studies" » "World Bank regional and electrical injuries", "World Bank regional and electrical services", "World Bank regional and electrical sounding"
"World Bank regional and electrical sources" » "World Bank regional and electrical sciences", "World Bank regional and electrical services", "World Bank regional and electron sources"
"world bank regional and electoral studies" » "world bank regional and sectoral studies", "world bank regional and spectral 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"

Try widening your search to All Fields.

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