Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"modified notion optimisation algorithms" » "modified notion optimisation algorithm", "modified notion optimization algorithms", "modified notion estimation algorithm", "modified network optimization algorithms"

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