Perhaps you should try some spelling variations:
"international services in operations research & management science" » "integration services in operations research & management science", "international overview in operations research & management science", "international practices in operations research & management science", "international overviews in operations research & management science", "international justices in operations research & management science", "international sciences in operations research & management science"
"international service in operations research & management science" » "international overview in operations research & management science", "international justice in operations research & management science", "international science in operations research & management science"
"international reserves in operations research & management science" » "international serves in operations research & management science"

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: (((("international services in operations research & management science") OR ("international service in operations research & management science"))) OR ("international reserves in operations research & management science")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"international services in operations research & management science\") OR (\"international service in operations research & management science\"))) or (\"international reserves in operations research & management science\"))".
• Removing quotes may allow a broader search: (((( international services in operations research & management science ) OR ( international service in operations research & management science ))) or ( international reserves in operations research & management science )).
• Adding a wildcard symbol may retrieve word variants: (((("international services in operations research & management science") OR ("international service in operations research & management science"))) or ("international reserves in operations research & management science"))*.