Perhaps you should try some spelling variations:
"electrical engineer's" » "electrical engine", "electric engineering", "electronics engineers"
"electrical engineers" » "mechanical engineers", "chemical engineers"
"electrical machine" » "electrical machines", "electric machines", "electric machinery"

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: (("electrical engineer's") OR ((("electrical machine") OR ((("electrical engineers") OR ("electrical engineering")))))).
• Removing quotes may allow a broader search: (( electrical engineer's ) or ((( electrical machine ) or ((( electrical engineers ) or ( electrical engineering )))))).
• Adding a wildcard symbol may retrieve word variants: (("electrical engineer's") or ((("electrical machine") or ((("electrical engineers") or ("electrical engineering"))))))*.