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