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