Perhaps you should try some spelling variations:
"modified invasive optimization algorithms" » "modified invasive optimisation algorithm", "modified invasive estimation algorithms", "modified invasive estimation algorithm", "modified invasive optimisation algorithms", "modified invasive estimation algorithmss", "modified passive optimization algorithms"
"modified df optimization algorithm" » "modified df optimisation algorithm", "modified df estimation algorithm", "modified df estimation algorithms", "modified _ optimization algorithm", "modified qoe optimization algorithm", "modified _ optimisation algorithm", "modified adam optimization algorithm", "modified bi1 optimization algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified invasive optimization algorithms\") OR (\"modified df optimization algorithm\"))~".
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