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 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("defined network estimation algorithms") or ("modified learning convolution algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("defined network estimation algorithms") OR ("modified learning convolution algorithm")).
• Removing quotes may allow a broader search: (( defined network estimation algorithms ) or ( modified learning convolution algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("defined network estimation algorithms") or ("modified learning convolution algorithm"))*.