Perhaps you should try some spelling variations:
"world bank regional and electrical sounding" » "world bank regional and electrical coupling", "world bank regional and electrical sensing", "world bank regional and electrical signaling", "world lanka regional and electrical sounding", "world mask regional and electrical sounding", "world park regional and electrical sounding"
"world bank regional and electrical services" » "world bank regional and electrical devices", "world bank regional and electrical nerve", "world bank regional and electronic services", "world lanka regional and electrical services", "world mask regional and electrical services", "world park regional and electrical services"
"world bank regional and electoral studies" » "world bank regional and sectoral studies", "world bank regional and electrical studies", "world bank regional and spectral studies", "world lanka regional and electoral studies", "world mask regional and electoral studies", "world park regional and electoral studies"

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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 sounding") OR ("world bank regional and electrical services")))).
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• Adding a wildcard symbol may retrieve word variants: (("world bank regional and electoral studies") or ((("world bank regional and electrical sounding") or ("world bank regional and electrical services"))))*.