Perhaps you should try some spelling variations:
"modified positive convolution algorithms" » "modified positive evolution algorithm", "modified positive solution algorithm", "modified positive solutions algorithms", "modified passive convolution algorithms", "modified adaptive convolution algorithms"
"modified invasive approximation algorithms" » "modified passive approximation 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 positive convolution algorithms") or ("modified invasive approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified positive convolution algorithms") OR ("modified invasive approximation algorithms")).
• Removing quotes may allow a broader search: (( modified positive convolution algorithms ) or ( modified invasive approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified positive convolution algorithms") or ("modified invasive approximation algorithms"))*.