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 lanka regional and electrical studies", "world mask regional and electrical studies", "world park regional and electrical studies"
"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 lanka regional and electrical sources", "world mask regional and electrical sources", "world park regional and electrical sources"
"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"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world bank regional and spectral 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 spectral 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 spectral studies") OR ((("world bank regional and electrical studies") OR ("world bank regional and electrical sources"))))*.