Perhaps you should try some spelling variations:
"electrical engineer's" » "electrical engineering", "electrical engine", "electric engineering"
"electrical engineers" » "electrical engineering", "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 machine") OR ("electrical engineer's"))) OR ("electrical engineers")).
• Removing quotes may allow a broader search: (((( electrical machine ) or ( electrical engineer's ))) or ( electrical engineers )).
• Adding a wildcard symbol may retrieve word variants: (((("electrical machine") or ("electrical engineer's"))) or ("electrical engineers"))*.