Perhaps you should try some spelling variations:
"mechanical engineering discoveries" » "mechanical engineering discovering", "mechanical engineering discovery", "mechanical engineering dictionaries", "electrical engineering discoveries"
"mechanical engineering fisheries" » "electrical engineering fisheries", "mechanical engineering fields", "mechanical engineering fire", "mechanical engineering features"
"mechanical engineering theories" » "electrical engineering theories", "mechanical engineering theory", "mechanical engineering theses", "mechanical engineering textiles"
"mechanical engineering properties" » "electrical engineering properties", "mechanical engineering processes", "mechanical engineering projects", "mechanical engineering proceedings"

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