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 doctoral studies" » "World Bank regional and doctoral students", "World Bank regional and doctoral student", "World Bank regional and cultural studies"
"world bank regional and spectral studies" » "world bank regional and structural 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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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("World Bank regional and doctoral studies") OR ("world bank regional and spectral studies"))) OR ("world bank regional and sectional studies")).
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• Adding a wildcard symbol may retrieve word variants: (((("World Bank regional and doctoral studies") or ("world bank regional and spectral studies"))) or ("world bank regional and sectional studies"))*.