Perhaps you should try some spelling variations:
"modified near approximation algorithm" » "modified near approximation algorithms", "modified one approximation algorithm", "modified network approximation algorithm", "modified _ approximation algorithm", "modified seird approximation algorithm", "modified adam approximation algorithm"
"modified parameter estimation algorithms" » "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter optimisation algorithm", "modified parameter estimates 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 estimation algorithms") or ("modified near approximation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified parameter estimation algorithms") OR ("modified near approximation algorithm")).
• Removing quotes may allow a broader search: (( modified parameter estimation algorithms ) or ( modified near approximation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified parameter estimation algorithms") or ("modified near approximation algorithm"))*.