Perhaps you should try some spelling variations:
"modified allocation optimisation algorithms" » "modified allocation optimization algorithms", "modified allocation estimation algorithms", "modified allocation estimation algorithm", "modified allocation optimization algorithmss", "modified allocation estimation algorithmss"
"modified topology optimisation algorithm" » "modified topology optimization algorithms", "modified topology estimation algorithm", "modified topology estimation algorithms", "modified topology optimization algorithm", "modified policy optimization algorithm"

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