Perhaps you should try some spelling variations:
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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: "((\"audience perceptions in java programming\") OR (\"advanced python python computers programming\"))~".
• Removing quotes may allow a broader search: (( audience perceptions in java programming ) OR ( advanced python python computers programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("audience perceptions in java programming") OR ("advanced python python computers programming"))*.