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