Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"modified parameters estimation algorithmss" » "modified parameters estimation algorithms", "modified parameters estimation algorithm", "modified parameters optimization algorithms", "modified parameter estimation algorithmss", "modified parameter estimates algorithmss", "modified parameter optimization algorithmss"

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