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 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"
"world bank regional and sector studies" » "world bank regional and receptor studies", "world lanka regional and sector studies", "world mask regional and sector studies", "world park regional and sector studies"

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