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

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