Perhaps you should try some spelling variations:
"electrical engineer's" » "electrical engineers", "electrical engineering", "electrical engine"
"electrical charging" » "electric charging", "electrical aging", "electrical imaging"
"electrical charge" » "electric charge", "electrical discharge", "electrical discharges"

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 charging") OR ("electrical charge")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"electrical engineer's\") or (((\"electrical charging\") OR (\"electrical charge\"))))".
• Removing quotes may allow a broader search: (( electrical engineer's ) or ((( electrical charging ) OR ( electrical charge )))).
• Adding a wildcard symbol may retrieve word variants: (("electrical engineer's") or ((("electrical charging") OR ("electrical charge"))))*.