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