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