Perhaps you should try some spelling variations:
"engineering economic" » "engineering economy"
"engineering economics" » "engineering economys"
"engineering second" » "engineering section", "engineering selected", "engineering economy"

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 second"))) OR ("engineering economics")).
• Removing quotes may allow a broader search: (((( engineering economic ) or ( engineering second ))) or ( engineering economics )).
• Adding a wildcard symbol may retrieve word variants: (((("engineering economic") or ("engineering second"))) or ("engineering economics"))*.