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