Perhaps you should try some spelling variations:
"modified dfverage 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.

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