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