Perhaps you should try some spelling variations:
"mechanical engineering discoveries" » "mechanical engineering discovering", "mechanical engineering discovery", "mechanical engineering dictionaries"
"electrical engineering fisheries" » "electrical engineering theories", "electrical engineering properties", "electrical engineering fire"
"mechanical engineering fields" » "mechanical bioengineering fields", "mechanical engineering fluid", "mechanical engineering food"

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: (((("mechanical engineering fields") OR ("mechanical engineering discoveries"))) OR ("electrical engineering fisheries")).
• Removing quotes may allow a broader search: (((( mechanical engineering fields ) or ( mechanical engineering discoveries ))) or ( electrical engineering fisheries )).
• Adding a wildcard symbol may retrieve word variants: (((("mechanical engineering fields") or ("mechanical engineering discoveries"))) or ("electrical engineering fisheries"))*.