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

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 designs\") OR (\"computer guided designs\"))".
• Removing quotes may allow a broader search: (( computer added designs ) OR ( computer guided designs )).
• Adding a wildcard symbol may retrieve word variants: (("computer added designs") OR ("computer guided designs"))*.