Perhaps you should try some spelling variations:
"electrical engineer's" » "electrical engineers", "electrical engineering", "electrical engine"
"electrical machine" » "electrical machines", "electric machines", "electric machinery"
"electrical line" » "electrical life", "electrical engine", "electrical aging"

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