Perhaps you should try some spelling variations:
"electrical engineers" » "mechanical engineers"
"chemical engineers" » "chemical engineering", "mechanical engineers"
"electrical line" » "electrical life", "electrical engine", "electrical aging"

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