Perhaps you should try some spelling variations:
"modified based optimization algorithms" » "modified based optimisation algorithm", "modified based estimation algorithms", "modified based estimation algorithm", "modified game optimization algorithms", "modified market optimization algorithms", "modified qoe optimization algorithms", "modified male optimization algorithms"
"modified notion optimizer algorithms" » "modified notion optimized algorithms", "modified notion optimized algorithm"

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