Perhaps you should try some spelling variations:
"engineering economic" » "engineering economics"
"engineering selected" » "engineering select", "engineering science", "engineering sciences"
"engineering economy" » "engineering economics"
"engineering second" » "engineering section", "engineering sensors", "engineering select"

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