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 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: (("modified network optimization algorithms") OR ("modified learning convolution algorithm"))~.
• Removing quotes may allow a broader search: (( modified network optimization algorithms ) or ( modified learning convolution algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified network optimization algorithms") or ("modified learning convolution algorithm"))*.