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