Perhaps you should try some spelling variations:
"introduction learning / computer programs" » "introduction defining / computer programs", "introduction containing / computer programs"
"introduction learning / computer program" » "introduction defining / computer program", "introduction containing / computer program"

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: "((\"introduction learning / computer programs\") OR (\"introduction learning / computer program\"))".
• Removing quotes may allow a broader search: (( introduction learning / computer programs ) OR ( introduction learning / computer program )).
• Adding a wildcard symbol may retrieve word variants: (("introduction learning / computer programs") OR ("introduction learning / computer program"))*.