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

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