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 parameter optimisation algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter estimation 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 positive convolution algorithms") OR ("modified parameter optimisation algorithm"))~.
• Removing quotes may allow a broader search: (( modified positive convolution algorithms ) or ( modified parameter optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified positive convolution algorithms") or ("modified parameter optimisation algorithm"))*.