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 temporal studies" » "world park regional and temporal study", "world park regional and temporal series", "world park regional and temporal arteries", "world parks regional and temporal studies", "world part regional and temporal studies", "world park region and temporal studies", "world par regional and temporal studies", "world pork regional and temporal studies"
"world's urban regional and sectoral studies" » "world's urban regional and sector studies", "world's urban regional and spectral studies", "world's urban regional and structural studies", "world's urban regions and sectoral studies", "world's european regional and sectoral studies", "world urban regional and sectoral studies", "world's carbon regional and sectoral studies", "world's great regional and sectoral studies"
"world park regional and sectoral studies" » "world park regional and sector studies", "world park regional and spectral studies", "world park regional and structural studies", "world parks regional and sectoral studies", "world part regional and sectoral studies", "world park region and sectoral studies", "world par regional and sectoral studies", "world pork regional and sectoral studies"
"world park regional and doctoral studies" » "world park regional and doctoral students", "world park regional and doctoral student", "world park regional and cultural studies", "world parks regional and doctoral studies", "world part regional and doctoral studies", "world park region and doctoral studies", "world par regional and doctoral studies", "world pork regional and doctoral 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"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world's urban regional and sectoral studies") OR ((((("world park regional and sectoral studies") OR ("world park regional and temporal studies"))) OR ("world park regional and doctoral studies"))))) OR ((("world bank regional and sectional studies") OR ("world bank regional and sectional study")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"world's urban regional and sectoral studies\") or (((((\"world park regional and sectoral studies\") OR (\"world park regional and temporal studies\"))) or (\"world park regional and doctoral studies\"))))) or (((\"world bank regional and sectional studies\") or (\"world bank regional and sectional study\"))))".
• Removing quotes may allow a broader search: (((( world's urban regional and sectoral studies ) or ((((( world park regional and sectoral studies ) OR ( world park regional and temporal studies ))) or ( world park regional and doctoral studies ))))) or ((( world bank regional and sectional studies ) or ( world bank regional and sectional study )))).
• Adding a wildcard symbol may retrieve word variants: (((("world's urban regional and sectoral studies") or ((((("world park regional and sectoral studies") OR ("world park regional and temporal studies"))) or ("world park regional and doctoral studies"))))) or ((("world bank regional and sectional studies") or ("world bank regional and sectional study"))))*.