Perhaps you should try some spelling variations:
"modified network approximation algorithm" » "modified network approximation algorithms", "certified network approximation algorithm", "defined network approximation algorithm", "modified near approximation algorithm"
"modified parameter estimates algorithms" » "modified parameter estimation algorithms", "modified parameter estimation algorithm", "modified parameter optimized algorithms"

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: (("modified parameter estimates algorithms") or ("modified network approximation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified parameter estimates algorithms") OR ("modified network approximation algorithm")).
• Removing quotes may allow a broader search: (( modified parameter estimates algorithms ) or ( modified network approximation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified parameter estimates algorithms") or ("modified network approximation algorithm"))*.