Perhaps you should try some spelling variations:
"modified dddohcadverage approximation algorithms" » "modified average approximation algorithms"
"modified orca convolution algorithms" » "modified orca evolution algorithm", "modified orca solution algorithm", "modified dorca convolution algorithms", "modified orcad convolution algorithms", "modified ohca convolution algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified orca convolution algorithms") or ("modified dddohcadverage approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified orca convolution algorithms") OR ("modified dddohcadverage approximation algorithms")).
• Removing quotes may allow a broader search: (( modified orca convolution algorithms ) or ( modified dddohcadverage approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified orca convolution algorithms") or ("modified dddohcadverage approximation algorithms"))*.