Perhaps you should try some spelling variations:
"modified allocation optimization algorithms" » "modified allocation optimisation algorithm", "modified allocation estimation algorithms", "modified allocation optimized algorithms", "modified location optimization algorithms"
"modified adaptive estimation algorithm" » "modified adaptive ventilation algorithm", "modified quantile estimation algorithm", "modified adaptive quantization algorithm", "modified passive estimation algorithm"

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