MPG.eBooks - Search Results - (((((((("operational systems") or ("operating systems"))) or ("conversational systems"))) or ((("relational systems") OR ("national systems"))))) or ("operation system"))

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If you are trying to use Boolean operators, they must be ALL CAPS: (((((((("operational systems") OR ("operating systems"))) OR ("conversational systems"))) OR ((("relational systems") OR ("national systems"))))) OR ("operation system")).
The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"operational systems\") or (\"operating systems\"))) or (\"conversational systems\"))) or (((\"relational systems\") OR (\"national systems\"))))) or (\"operation system\"))".
Removing quotes may allow a broader search: (((((((( operational systems ) or ( operating systems ))) or ( conversational systems ))) or ((( relational systems ) OR ( national systems ))))) or ( operation system )).
Adding a wildcard symbol may retrieve word variants: (((((((("operational systems") or ("operating systems"))) or ("conversational systems"))) or ((("relational systems") OR ("national systems"))))) or ("operation system"))*.