Perhaps you should try some spelling variations:
"electrical engineers's" » "electrical engineer's", "electric engineering", "electrical engine"
"practical engineering" » "physical engineering", "acoustical engineering", "structural engineering"
"optical engineering" » "chemical engineering", "biomedical 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: (("practical engineer") OR ((((("electrical engineers's") OR ((("practical engineering") OR ("optical engineering"))))) OR ("electrical engineering")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"practical engineer\") or (((((\"electrical engineers's\") or (((\"practical engineering\") OR (\"optical engineering\"))))) or (\"electrical engineering\"))))".
• Removing quotes may allow a broader search: (( practical engineer ) or ((((( electrical engineers's ) or ((( practical engineering ) OR ( optical engineering ))))) or ( electrical engineering )))).
• Adding a wildcard symbol may retrieve word variants: (("practical engineer") or ((((("electrical engineers's") or ((("practical engineering") OR ("optical engineering"))))) or ("electrical engineering"))))*.