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