Perhaps you should try some spelling variations:
"modified df convolution algorithms" » "modified df evolution algorithm", "modified df solution algorithm", "modified d convolutional algorithms", "modified _ convolution algorithms", "modified adam convolution algorithms", "modified bi1 convolution algorithms"
"modified parameter estimation algorithm" » "modified parameter estimates algorithm", "modified parameter optimization 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 parameter estimation algorithm") OR ("modified df convolution algorithms"))~.
• Removing quotes may allow a broader search: (( modified parameter estimation algorithm ) or ( modified df convolution algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified parameter estimation algorithm") or ("modified df convolution algorithms"))*.