Perhaps you should try some spelling variations:
"engineering economic" » "engineering economics", "engineering economy"
"engineering selected" » "engineering select", "engineering science", "engineering sciences"
"engineering sensors" » "engineering sciences"
"engineering second" » "engineering section", "engineering economy", "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 second") OR ("engineering sensors"))) OR ("engineering selected")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"engineering economic\") or (((((\"engineering second\") OR (\"engineering sensors\"))) or (\"engineering selected\"))))".
• Removing quotes may allow a broader search: (( engineering economic ) or ((((( engineering second ) OR ( engineering sensors ))) or ( engineering selected )))).
• Adding a wildcard symbol may retrieve word variants: (("engineering economic") or ((((("engineering second") OR ("engineering sensors"))) or ("engineering selected"))))*.