Perhaps you should try some spelling variations:
"mechanical engineering" » "electrical engineering"
"electrical engineers" » "electrical engineering"
"chemical engineering" » "electrical 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: (((("electrical engineers") OR ((("chemical engineers") OR ("chemical engineering"))))) OR ((("mechanical engineers") OR ("mechanical engineering")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"electrical engineers\") or (((\"chemical engineers\") OR (\"chemical engineering\"))))) or (((\"mechanical engineers\") or (\"mechanical engineering\"))))".
• Removing quotes may allow a broader search: (((( electrical engineers ) or ((( chemical engineers ) OR ( chemical engineering ))))) or ((( mechanical engineers ) or ( mechanical engineering )))).
• Adding a wildcard symbol may retrieve word variants: (((("electrical engineers") or ((("chemical engineers") OR ("chemical engineering"))))) or ((("mechanical engineers") or ("mechanical engineering"))))*.