Perhaps you should try some spelling variations:
"computers / computer literatur / bisacsh" » "computers / computers literatur / bisacsh", "computers / computers literature / bisacsh", "computers / computer literacy / bisacsh"
"computers / computer literary / bisacsh" » "computers / computer literacy / bisacsh", "computers / computer linear / bisacsh", "computers / computers literature / bisacsh"

Try widening your search to All Fields.

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