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 temporal studies" » "world bank regional and temporal series", "world bank regional and temporal study", "world bank regional and sectoral studies", "world lanka regional and temporal studies", "world mask regional and temporal studies", "world park regional and temporal studies"
"world bank regional and spectral studies" » "world bank regional and structural studies", "world lanka regional and spectral studies", "world mask regional and spectral studies", "world park regional and spectral studies"
"world bank regional and general studies" » "world bank regional and genetic studies", "world lanka regional and general studies", "world mask regional and general studies", "world park regional and general studies"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world bank regional and temporal studies") OR ((("world bank regional and spectral studies") OR ("world bank regional and general studies"))))) OR ("world bank regional and sectional studies")).
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• Adding a wildcard symbol may retrieve word variants: (((("world bank regional and temporal studies") or ((("world bank regional and spectral studies") or ("world bank regional and general studies"))))) or ("world bank regional and sectional studies"))*.