Perhaps you should try some spelling variations:
"electrical engineers's" » "electrical engineer's", "electric engineering", "electrical engine", "electrical engineer'ss's", "electrical engines's", "practical engineers's"
"electrical medicines" » "electrical machines", "electronic medicines", "electrical medical"
"electrical engineer" » "electrical engineer's", "electrical engine", "practical engineer"
"electrical engineering" » "electrical engineer'sing", "electrical engineing", "practical engineering"

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