Perhaps you should try some spelling variations:
"world bank regional and electrical studies" » "world bank regional and electrical injuries", "world bank regional and electrical services", "world bank regional and electrical sounding", "world lanka regional and electrical studies", "world mask regional and electrical studies", "world park regional and electrical studies"
"world bank regional and electrical sources" » "world bank regional and electrical sciences", "world bank regional and electrical services", "world bank regional and electron sources", "world lanka regional and electrical sources", "world mask regional and electrical sources", "world park regional and electrical sources"
"world bank regional and electrical science" » "world bank regional and electrical sciences", "world bank regional and electrochemical science", "world bank regional and electrical signal", "world lanka regional and electrical science", "world mask regional and electrical science", "world park regional and electrical science"
"world bank regional and empirical science" » "world bank regional and empirical sciences", "world bank regional and empirical evidence", "world bank regional and empirical evidences", "world lanka regional and empirical science", "world mask regional and empirical science", "world park regional and empirical science"
"world bank regional and sectoral studies" » "world bank regional and sectional studies", "world bank regional and spectral studies", "world bank regional and sector studies", "world lanka regional and sectoral studies", "world mask regional and sectoral studies", "world park regional and sectoral studies"

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 bank regional and sectoral studies") OR ((("world bank regional and electrical studies") OR ((("world bank regional and electrical sources") OR ((("world bank regional and electrical science") OR ("world bank regional and empirical science")))))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world bank regional and sectoral studies\") or (((\"world bank regional and electrical studies\") or (((\"world bank regional and electrical sources\") or (((\"world bank regional and electrical science\") OR (\"world bank regional and empirical science\"))))))))".
• Removing quotes may allow a broader search: (( world bank regional and sectoral studies ) or ((( world bank regional and electrical studies ) or ((( world bank regional and electrical sources ) or ((( world bank regional and electrical science ) OR ( world bank regional and empirical science )))))))).
• Adding a wildcard symbol may retrieve word variants: (("world bank regional and sectoral studies") or ((("world bank regional and electrical studies") or ((("world bank regional and electrical sources") or ((("world bank regional and electrical science") OR ("world bank regional and empirical science"))))))))*.