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 machinery", "practical machine"
"electric machines" » "electrical machines"
"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 engineers") OR ("electrical engineer's"))) OR ((("electrical line") OR ((("electrical machine") OR ("electric machines")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"electrical engineers\") or (\"electrical engineer's\"))) or (((\"electrical line\") or (((\"electrical machine\") OR (\"electric machines\"))))))".
• Removing quotes may allow a broader search: (((( electrical engineers ) or ( electrical engineer's ))) or ((( electrical line ) or ((( electrical machine ) OR ( electric machines )))))).
• Adding a wildcard symbol may retrieve word variants: (((("electrical engineers") or ("electrical engineer's"))) or ((("electrical line") or ((("electrical machine") OR ("electric machines"))))))*.