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 allocation optimisation algorithms\") OR (\"modified topology optimisation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified allocation optimisation algorithms ) OR ( modified topology optimisation algorithm ))~.
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