Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"designed network estimation algorithmss" » "designed network estimation algorithms", "designed network estimation algorithm", "designed network optimization algorithms", "designed network optimization algorithmss", "defined network estimation algorithmss"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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