Perhaps you should try some spelling variations:
"modified notion estimation algorithmss" » "modified notion estimation algorithms", "modified notion estimation algorithm", "modified notion optimization algorithms", "modified motion estimation algorithmss"
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective approximation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified notion estimation algorithmss") OR ("modified objective allocation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified notion estimation algorithmss\") OR (\"modified objective allocation algorithms\"))*".
• Removing quotes may allow a broader search: (( modified notion estimation algorithmss ) OR ( modified objective allocation algorithms ))*.