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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("world bank regional and sectional studies") OR ((("world bank regional and electoral studies") OR ("world bank regional and sectoral studies")))).
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