Perhaps you should try some spelling variations:
"modified orca approximation algorithm" » "modified orca approximation algorithms", "modified one approximation algorithm", "modified _ approximation algorithm", "modified time approximation algorithm"
"modified learning convolution algorithm" » "modified learning convolution algorithms", "modified learning evolution algorithm", "modified learning solution algorithm", "mobile learning convolution algorithm", "modified caging convolution algorithm"

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 orca approximation algorithm") OR ("modified learning convolution algorithm"))~.
• Removing quotes may allow a broader search: (( modified orca approximation algorithm ) or ( modified learning convolution algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified orca approximation algorithm") or ("modified learning convolution algorithm"))*.