Perhaps you should try some spelling variations:
"engineering economic" » "engineering economics", "engineering economy", "engineering second"
"engineering selected" » "engineering select", "engineering sciences", "engineering service"
"engineering science" » "engineers geoscience", "engineering select", "engineering reference"

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