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 observational studies", "world lanka regional and sectional studies", "world mask regional and sectional studies", "world urbano regional and sectional studies"
"world park regional and spectral studies" » "world park regional and structural studies", "world park regional and general studies", "world parks regional and spectral studies", "world part regional and spectral studies", "world park region and spectral studies", "world par regional and spectral studies", "world pork regional and spectral studies"
"world bank regional and social studies" » "world lanka regional and social studies", "world mask regional and social studies", "world urbano regional and social studies"
"world bank regional and sectional study" » "world lanka regional and sectional study", "world mask regional and sectional study", "world urbano regional and sectional study"

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