Perhaps you should try some spelling variations:
"modified network optimization algorithms" » "modified network optimisation algorithm", "modified network estimation algorithms", "modified network estimation algorithm", "certified network optimization algorithms", "defined network optimization algorithms", "modified near optimization algorithms"
"modified model convolution algorithms" » "modified model evolution algorithm", "modified model solution algorithm", "modified male convolution 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 model convolution algorithms") OR ("modified network optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified model convolution algorithms ) or ( modified network optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified model convolution algorithms") or ("modified network optimization algorithms"))*.