Perhaps you should try some spelling variations:
"modified trained convolution algorithms" » "modified trained evolution algorithm", "modified trained solution algorithm", "modified trained convolutional algorithms", "modified traces convolution algorithms"
"modified average approximation algorithms" » "modified coverage approximation 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 average approximation algorithms") OR ("modified trained convolution algorithms"))~.
• Removing quotes may allow a broader search: (( modified average approximation algorithms ) or ( modified trained convolution algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified average approximation algorithms") or ("modified trained convolution algorithms"))*.