Perhaps you should try some spelling variations:
"modified effects optimization algorithms" » "modified effects optimisation algorithm", "modified effects estimation algorithms", "modified effects optimized algorithms", "modified affects digitization algorithms"
"modified objective estimation algorithm" » "modified objective optimization algorithm", "modified objective allocation algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified effects optimization algorithms\") OR (\"modified objective estimation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified effects optimization algorithms ) OR ( modified objective estimation algorithm ))~.
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