Perhaps you should try some spelling variations:
"computer added design" » "computer aided design", "computer guided design", "computer age design", "computer adder design", "computer added designed"
"computer added designs" » "computer aided designs", "computer guided designs", "computer age designs", "computer adder designs", "computer added designed", "computer added designeds"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"computer added design\") OR (\"computer added designs\"))".
• Removing quotes may allow a broader search: (( computer added design ) OR ( computer added designs )).
• Adding a wildcard symbol may retrieve word variants: (("computer added design") OR ("computer added designs"))*.