Perhaps you should try some spelling variations:
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"using computational and computer program" » "and computational and computer program" (Expand search), "using computational fluid computer program" (Expand search), "using computational _ computer program" (Expand search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("using computational and computer program") OR ("advanced duplication in computing program"))~.
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• Removing quotes may allow a broader search: (( using computational and computer program ) OR ( advanced duplication in computing program ))*.