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